chore(lint): Removed deprecated varcheck linter (#11910)

.golangci.yml

@@ -17,7 +17,6 @@ linters:
     - typecheck
     - unconvert
     - unused
-    - varcheck
 
 linters-settings:
   revive:

plugins/inputs/phpfpm/fcgi.go

@@ -45,14 +45,12 @@ const (
 	maxPad   = 255
 )
 
-//nolint:varcheck // For having proper order
 const (
 	roleResponder = iota + 1 // only Responders are implemented.
 	roleAuthorizer
 	roleFilter
 )
 
-//nolint:varcheck // For having proper order
 const (
 	statusRequestComplete = iota
 	statusCantMultiplex

plugins/inputs/zfs/zfs.go

@@ -19,9 +19,9 @@ type Zfs struct {
 	KstatMetrics   []string
 	PoolMetrics    bool
 	DatasetMetrics bool
-	sysctl         Sysctl          //nolint:varcheck,unused // False positive - this var is used for non-default build tag: freebsd
-	zpool          Zpool           //nolint:varcheck,unused // False positive - this var is used for non-default build tag: freebsd
-	zdataset       Zdataset        //nolint:varcheck,unused // False positive - this var is used for non-default build tag: freebsd
+	sysctl         Sysctl          //nolint:unused // False positive - this var is used for non-default build tag: freebsd
+	zpool          Zpool           //nolint:unused // False positive - this var is used for non-default build tag: freebsd
+	zdataset       Zdataset        //nolint:unused // False positive - this var is used for non-default build tag: freebsd
 	Log            telegraf.Logger `toml:"-"`
 }