Merge pull request #13141 from mmorel-35/patch-1

tsdb/errors: fix errorlint linter

tsdb/errors/errors.go

@@ -38,7 +38,8 @@ func (es *multiError) Add(errs ...error) {
 		if err == nil {
 			continue
 		}
-		if merr, ok := err.(nonNilMultiError); ok {
+		var merr nonNilMultiError
+		if errors.As(err, &merr) {
 			*es = append(*es, merr.errs...)
 			continue
 		}