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

modules/timeutil/since.go

@@ -23,7 +23,7 @@ const (
 )
 
 func computeTimeDiffFloor(diff int64, lang translation.Locale) (int64, string) {
-	diffStr := ""
+	var diffStr string
 	switch {
 	case diff <= 0:
 		diff = 0