Replace interface{} with any (#25686)

Result of running `perl -p -i -e 's#interface\{\}#any#g' **/*` and `make fmt`.

Basically the same [as golang did](2580d0e08d).

cmd/serv.go

@@ -95,7 +95,7 @@ var (
 
 // fail prints message to stdout, it's mainly used for git serv and git hook commands.
 // The output will be passed to git client and shown to user.
-func fail(ctx context.Context, userMessage, logMsgFmt string, args ...interface{}) error {
+func fail(ctx context.Context, userMessage, logMsgFmt string, args ...any) error {
 	if userMessage == "" {
 		userMessage = "Internal Server Error (no specific error)"
 	}