replace dead links (#22530)
diff --git a/lib/ui/platform_dispatcher.dart b/lib/ui/platform_dispatcher.dart
index 091ef92..34be9b8 100644
--- a/lib/ui/platform_dispatcher.dart
+++ b/lib/ui/platform_dispatcher.dart
@@ -1285,8 +1285,8 @@
///
/// The subtag values are _case sensitive_ and must be one of the valid
/// subtags according to CLDR supplemental data:
- /// [language](http://unicode.org/cldr/latest/common/validity/language.xml),
- /// [region](http://unicode.org/cldr/latest/common/validity/region.xml). The
+ /// [language](https://github.com/unicode-org/cldr/blob/master/common/validity/language.xml),
+ /// [region](https://github.com/unicode-org/cldr/blob/master/common/validity/region.xml). The
/// primary language subtag must be at least two and at most eight lowercase
/// letters, but not four letters. The region region subtag must be two
/// uppercase letters or three digits. See the [Unicode Language
@@ -1313,9 +1313,9 @@
///
/// The subtag values are _case sensitive_ and must be valid subtags according
/// to CLDR supplemental data:
- /// [language](http://unicode.org/cldr/latest/common/validity/language.xml),
- /// [script](http://unicode.org/cldr/latest/common/validity/script.xml) and
- /// [region](http://unicode.org/cldr/latest/common/validity/region.xml) for
+ /// [language](https://github.com/unicode-org/cldr/blob/master/common/validity/language.xml),
+ /// [script](https://github.com/unicode-org/cldr/blob/master/common/validity/script.xml) and
+ /// [region](https://github.com/unicode-org/cldr/blob/master/common/validity/region.xml) for
/// each of languageCode, scriptCode and countryCode respectively.
///
/// The [countryCode] subtag is optional. When there is no country subtag,
@@ -1351,7 +1351,7 @@
///
/// This must be a valid Unicode Language subtag as listed in [Unicode CLDR
/// supplemental
- /// data](http://unicode.org/cldr/latest/common/validity/language.xml).
+ /// data](https://github.com/unicode-org/cldr/blob/master/common/validity/language.xml).
///
/// See also:
///
@@ -1449,7 +1449,7 @@
///
/// This must be a valid Unicode Language Identifier script subtag as listed
/// in [Unicode CLDR supplemental
- /// data](http://unicode.org/cldr/latest/common/validity/script.xml).
+ /// data](https://github.com/unicode-org/cldr/blob/master/common/validity/script.xml).
///
/// See also:
///
