chore!: bump go version to 1.21 (#71)

.changelog/71.txt

@@ -0,0 +1,7 @@
+```release-note:note
+`linters` - Remove deprecated linters.
+```
+
+```release-note:breaking-change
+`golang` - Upgrade to Golang 1.21.
+```

.github/workflows/tests.yml

@@ -41,7 +41,7 @@ jobs:
       fail-fast: false
       matrix:
         go:
-          - '1.20'
+          - '1.21'
     steps:
       - uses: actions/setup-go@v5
         with:

.golangci.yml

@@ -1,21 +1,18 @@
 # Visit https://golangci-lint.run/ for usage documentation
 # and information on other useful linters
 issues:
-  max-per-linter: 0
   max-same-issues: 0
 
 linters:
   enable:
     - asciicheck # Simple linter to check that your code does not contain non-ASCII identifiers [fast: true, auto-fix: false]
     - bidichk # Checks for dangerous unicode character sequences [fast: true, auto-fix: false]
-    - deadcode # Finds unused code [fast: false, auto-fix: false]
     - decorder # check declaration order and count of types, constants, variables and functions [fast: true, auto-fix: false]
     - dogsled # Checks assignments with too many blank identifiers (e.g. x, _, _, _, := f()) [fast: true, auto-fix: false]
     - durationcheck # check for two durations multiplied together [fast: false, auto-fix: false]
     - errcheck # Errcheck is a program for checking for unchecked errors in go programs. These unchecked errors can be critical bugs in some cases [fast: false, auto-fix: false]
     - errchkjson # Checks types passed to the json encoding functions. Reports unsupported types and optionally reports occasions, where the check for the returned error can be omitted. [fast: false, auto-fix: false]
     - errname # Checks that sentinel errors are prefixed with the `Err` and error types are suffixed with the `Error`. [fast: false, auto-fix: false]
-    - execinquery # execinquery is a linter about query string checker in Query function which reads your Go src files and warning it finds [fast: false, auto-fix: false]
     - exportloopref # checks for pointers to enclosing loop variables [fast: false, auto-fix: false]
     - forbidigo # Forbids identifiers [fast: true, auto-fix: false]
     - gci # Gci controls golang package import order and makes it always deterministic. [fast: true, auto-fix: false]
@@ -33,7 +30,6 @@ linters:
     - gosimple #(megacheck): Linter for Go source code that specializes in simplifying a code [fast: false, auto-fix: false]
     - govet #(vet, vetshadow): Vet examines Go source code and reports suspicious constructs, such as Printf calls whose arguments do not align with the format string [fast: false, auto-fix: false]
     - grouper # An analyzer to analyze expression groups. [fast: true, auto-fix: false]
-    - ifshort # Checks that your code uses short syntax for if-statements whenever possible [fast: true, auto-fix: false]
     - importas # Enforces consistent import aliases [fast: false, auto-fix: false]
     - ineffassign # Detects when assignments to existing variables are not used [fast: true, auto-fix: false]
     - makezero # Finds slice declarations with non-zero initial length [fast: false, auto-fix: false]
@@ -48,14 +44,12 @@ linters:
     - revive # Fast, configurable, extensible, flexible, and beautiful linter for Go. Drop-in replacement of golint. [fast: false, auto-fix: false]
     - rowserrcheck # checks whether Err of rows is checked successfully [fast: false, auto-fix: false]
     - sqlclosecheck # Checks that sql.Rows and sql.Stmt are closed. [fast: false, auto-fix: false]
-    - structcheck # Finds unused struct fields [fast: false, auto-fix: false]
     - stylecheck # Stylecheck is a replacement for golint [fast: false, auto-fix: false]
     - tagliatelle # Checks the struct tags. [fast: true, auto-fix: false]
     - tenv # tenv is analyzer that detects using os.Setenv instead of t.Setenv since Go1.17 [fast: false, auto-fix: false]
     - tparallel # tparallel detects inappropriate usage of t.Parallel() method in your Go test codes [fast: false, auto-fix: false]
     - typecheck # Like the front-end of a Go compiler, parses and type-checks Go code [fast: false, auto-fix: false]
     - unconvert # Remove unnecessary type conversions [fast: false, auto-fix: false]
-    - varcheck # Finds unused global variables and constants [fast: false, auto-fix: false]
     - wastedassign # wastedassign finds wasted assignment statements. [fast: false, auto-fix: false]
     - whitespace # Tool for detection of leading and trailing whitespace [fast: true, auto-fix: true]
 
@@ -73,7 +67,6 @@ linters:
     - gocognit # Computes and checks the cognitive complexity of functions [fast: true, auto-fix: false]
     - godot # Check if comments end in a period [fast: true, auto-fix: true]
     - godox # Tool for detection of FIXME, TODO and other comment keywords [fast: true, auto-fix: false]
-    - goerr113 # Golang linter to check the errors handling expressions [fast: false, auto-fix: false]
     - gomnd # An analyzer to detect magic numbers. [fast: true, auto-fix: false]
     - lll # Reports long lines [fast: true, auto-fix: false]
     - maintidx # maintidx measures the maintainability index of each function. [fast: true, auto-fix: false]

attrtypes_test.go

@@ -36,7 +36,6 @@ func TestAttributeTypes(t *testing.T) {
 	}
 
 	got, err = supertypes.AttributeTypes[struct2](ctx)
-
 	if err != nil {
 		t.Fatalf("unexpected error")
 	}

go.mod

@@ -1,6 +1,8 @@
 module github.com/FrangipaneTeam/terraform-plugin-framework-supertypes
 
-go 1.20
+go 1.21
+
+toolchain go1.23.0
 
 require (
 	github.com/fatih/color v1.16.0