feat: update to go1.17 & update deps

This updates to go1.17, updates the core deps for the project, and also
removes the outdated vendoring system, we now use go modules only.

.goreleaser.yml

@@ -12,6 +12,7 @@ builds:
   - arm64
   - amd64
   - 386
+  gobinary: "go1.17.5"
 archives:
 - replacements:
     darwin: MacOS

go.mod

@@ -1,8 +1,33 @@
 module github.com/aauren/ntopng-exporter
 
-go 1.15
+go 1.17
 
 require (
-	github.com/prometheus/client_golang v1.8.0
-	github.com/spf13/viper v1.7.1
+	github.com/prometheus/client_golang v1.11.0
+	github.com/spf13/viper v1.10.1
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/fsnotify/fsnotify v1.5.1 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/magiconair/properties v1.8.5 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/mitchellh/mapstructure v1.4.3 // indirect
+	github.com/pelletier/go-toml v1.9.4 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
+	github.com/spf13/afero v1.6.0 // indirect
+	github.com/spf13/cast v1.4.1 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.2.0 // indirect
+	golang.org/x/sys v0.0.0-20211210111614-af8b64212486 // indirect
+	golang.org/x/text v0.3.7 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
+	gopkg.in/ini.v1 v1.66.2 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
 )