Upgrade all v1.4 build systems to use {os}-latest (#6329)

* Upgrade all v1.4 build systems to use `{os}-latest`

* update nightly and nuget releases also

build-system/nightly-builds.yaml

@@ -2,7 +2,7 @@
 # See https://docs.microsoft.com/en-us/azure/devops/pipelines/yaml-schema for reference
 
 pool:
-  vmImage: windows-2019
+  vmImage: windows-latest
   demands: Cmd
 
 trigger: none

build-system/pr-validation.yaml

@@ -19,7 +19,7 @@ jobs:
   - job: DocsSpellcheck
     displayName: "Docs: Spellcheck"
     pool:
-      vmImage: ubuntu-20.04
+      vmImage: ubuntu-latest
     steps:
       - checkout: self # self represents the repo where the initial Pipelines YAML file was found
         clean: false # whether to fetch clean each time
@@ -37,7 +37,7 @@ jobs:
   - job: DocsMarkdownLinting
     displayName: "Docs: Markdown Linting"
     pool:
-      vmImage: ubuntu-20.04
+      vmImage: ubuntu-latest
     steps:
       - checkout: self # self represents the repo where the initial Pipelines YAML file was found
         clean: false # whether to fetch clean each time
@@ -55,7 +55,7 @@ jobs:
   - job: WindowsBuild
     displayName: Windows Build
     pool:
-      vmImage: windows-2019
+      vmImage: windows-latest
       demands: Cmd
     steps:
       - checkout: self # self represents the repo where the initial Pipelines YAML file was found
@@ -98,7 +98,7 @@ jobs:
     parameters:
       name: "netfx_tests_windows"
       displayName: ".NET Framework Unit Tests (Windows)"
-      vmImage: "windows-2019"
+      vmImage: "windows-latest"
       scriptFileName: build.cmd
       scriptArgs: runTests incremental
       outputDirectory: "TestResults"
@@ -108,7 +108,7 @@ jobs:
     parameters:
       name: "net_core_tests_windows"
       displayName: ".NET Core Unit Tests (Windows)"
-      vmImage: "windows-2019"
+      vmImage: "windows-latest"
       scriptFileName: build.cmd
       scriptArgs: runTestsNetCore incremental
       outputDirectory: "TestResults"
@@ -118,7 +118,7 @@ jobs:
     parameters:
       name: "net_core_tests_linux"
       displayName: ".NET Core Unit Tests (Linux)"
-      vmImage: "ubuntu-18.04"
+      vmImage: "ubuntu-latest"
       scriptFileName: "./build.sh"
       scriptArgs: runTestsNetCore incremental
       outputDirectory: "TestResults"
@@ -128,7 +128,7 @@ jobs:
     parameters:
       name: "docfx_test"
       displayName: "DocFX warning check"
-      vmImage: "windows-2019"
+      vmImage: "windows-latest"
       scriptFileName: build.cmd
       scriptArgs: docfx
       outputDirectory: "TestResults"
@@ -139,7 +139,7 @@ jobs:
     parameters:
       name: "net_5_tests_windows"
       displayName: ".NET 5 Unit Tests (Windows)"
-      vmImage: "windows-2019"
+      vmImage: "windows-latest"
       scriptFileName: build.cmd
       scriptArgs: runTestsNet incremental
       outputDirectory: "TestResults"
@@ -149,7 +149,7 @@ jobs:
     parameters:
       name: "net_5_tests_linux"
       displayName: ".NET 5 Unit Tests (Linux)"
-      vmImage: "ubuntu-18.04"
+      vmImage: "ubuntu-latest"
       scriptFileName: "./build.sh"
       scriptArgs: runTestsNet incremental
       outputDirectory: "TestResults"
@@ -159,7 +159,7 @@ jobs:
     parameters:
       name: "net_core_mntr_windows"
       displayName: ".NET Core Multi-Node Tests (Windows)"
-      vmImage: "windows-2019"
+      vmImage: "windows-latest"
       scriptFileName: "build.cmd"
       scriptArgs: MultiNodeTestsNetCore incremental
       outputDirectory: "TestResults"
@@ -171,7 +171,7 @@ jobs:
     parameters:
       name: "net_5_mntr_windows"
       displayName: ".NET 5 Multi-Node Tests (Windows)"
-      vmImage: "windows-2019"
+      vmImage: "windows-latest"
       scriptFileName: "build.cmd"
       scriptArgs: MultiNodeTestsNet incremental
       outputDirectory: "TestResults"
@@ -183,7 +183,7 @@ jobs:
     parameters:
       name: "nuget_pack"
       displayName: "NuGet Pack"
-      vmImage: "windows-2019"
+      vmImage: "windows-latest"
       scriptFileName: build.cmd
       scriptArgs: CreateNuget nugetprerelease=dev incremental
       outputDirectory: "bin/nuget"

build-system/windows-release.yaml

@@ -2,7 +2,7 @@
 # See https://docs.microsoft.com/en-us/azure/devops/pipelines/yaml-schema for reference
 
 pool:
-  vmImage: windows-2019
+  vmImage: windows-latest
   demands: Cmd
 
 trigger: