Replace all instances of fmt.Errorf(%v) with fmt.Errorf(%w) (#21551)

Found using
`find . -type f -name '*.go' -print -exec vim {} -c
':%s/fmt\.Errorf(\(.*\)%v\(.*\)err/fmt.Errorf(\1%w\2err/g' -c ':wq' \;`

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/repo/repo.go

@@ -760,7 +760,7 @@ func CountRepositories(ctx context.Context, opts CountRepositoryOptions) (int64,
 
 	count, err := sess.Count(new(Repository))
 	if err != nil {
-		return 0, fmt.Errorf("countRepositories: %v", err)
+		return 0, fmt.Errorf("countRepositories: %w", err)
 	}
 	return count, nil
 }