Run gopls modernize on codebase (#34751)

Recent modernize fixes:
https://github.com/golang/tools/commits/master/gopls/internal/analysis/modernize

routers/web/repo/githttp.go

@@ -13,6 +13,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -363,12 +364,7 @@ func containsParentDirectorySeparator(v string) bool {
 	if !strings.Contains(v, "..") {
 		return false
 	}
-	for _, ent := range strings.FieldsFunc(v, isSlashRune) {
-		if ent == ".." {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(strings.FieldsFunc(v, isSlashRune), "..")
 }
 
 func isSlashRune(r rune) bool { return r == '/' || r == '\\' }