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).

modules/git/foreachref/parser_test.go

@@ -217,7 +217,7 @@ func TestParser(t *testing.T) {
 	}
 }
 
-func pretty(v interface{}) string {
+func pretty(v any) string {
 	data, err := json.MarshalIndent(v, "", "  ")
 	if err != nil {
 		// shouldn't happen