chore: Update to Go v1.21

- go mod tidy (all modules)
- go work sync
- Fixed plugin generation for Go 1.21
- Updated linting for Go 1.21
- Fixed minecraft example for Helm v3 pull download path
- Update dev docs to mention Go 1.21
- Regenerate plugins with Go 1.21

cmd/pluginator/internal/krmfunction/converter.go

@@ -86,7 +86,7 @@ func (c *Converter) Convert() error {
 }
 
 func (c *Converter) getDockerfile() string {
-	return `FROM golang:1.20-bullseye
+	return `FROM golang:1.21-bullseye
 ENV CGO_ENABLED=0
 WORKDIR /go/src/
 COPY . .

cmd/pluginator/internal/krmfunction/funcwrappersrc/go.mod.src

@@ -1,6 +1,6 @@
 module main
 
-go 1.20
+go 1.21
 
 require (
 	github.com/spf13/cobra v1.4.0