Fix missing error check of bufio.Scanner (#29882)

maybe more

modules/git/repo_stats.go

@@ -124,6 +124,10 @@ func (repo *Repository) GetCodeActivityStats(fromTime time.Time, branch string)
 					}
 				}
 			}
+			err = scanner.Err()
+			if err != nil {
+				return fmt.Errorf("scan: %w", err)
+			}
 			a := make([]*CodeActivityAuthor, 0, len(authors))
 			for _, v := range authors {
 				a = append(a, v)