Upgrade to Go 1.23

Fixes #12763

hugofs/fs.go

@@ -147,7 +147,8 @@ func isWrite(flag int) bool {
 // TODO(bep) move this to a more suitable place.
 func MakeReadableAndRemoveAllModulePkgDir(fs afero.Fs, dir string) (int, error) {
 	// Safe guard
-	if !strings.Contains(dir, "pkg") {
+	// Note that the base directory changed from pkg to gomod_cache in Go 1.23.
+	if !strings.Contains(dir, "pkg") && !strings.Contains(dir, "gomod") {
 		panic(fmt.Sprint("invalid dir:", dir))
 	}