Update go tool dependencies, restructure lint targets (#24239)

- Update all tool dependencies to latest tag
- Remove unused errcheck, it is part of golangci-lint
- Include main.go in air
- Enable wastedassign again now that it's
[generics-compatible](https://github.com/golangci/golangci-lint/pull/3689)
- Restructured lint targets to new `lint-*` namespace

routers/common/markup.go

@@ -20,7 +20,7 @@ import (
 
 // RenderMarkup renders markup text for the /markup and /markdown endpoints
 func RenderMarkup(ctx *context.Context, mode, text, urlPrefix, filePath string, wiki bool) {
-	markupType := ""
+	var markupType string
 	relativePath := ""
 
 	if len(text) == 0 {