Merge branch '5.3' into 5.4

* 5.3:
  Fix skip condition for INTL
  [Messenger] Fix `ErrorDetailsStamp` denormalization
  [Translation] Extract translatable content on twig set
  Simplify code
  Fix composer.json versions
  Fix composer.json versions
  Remove redundant license info
  [HttpFoundation] Fix isNotModified determination logic
  Fix Url Validator false positives
  [Translation] Reverse fallback locales
  [FrameworkBundle] Fall back to default configuration in debug:config and consistently resolve parameter values
  notifier smsapi - fixed checking whether message is sent
  allow null for framework.translator.default_path
  improve failure messages of the CrawlerSelectorTextContains constraint

Tests/AbstractAsciiTestCase.php

@@ -36,11 +36,13 @@ public function testCreateFromEmptyString()
 
     /**
      * @dataProvider provideBytesAt
-     *
-     * @requires extension intl 66.2
      */
     public function testBytesAt(array $expected, string $string, int $offset, int $form = null)
     {
+        if (2 !== grapheme_strlen('च्छे') && 'नमस्ते' === $string) {
+            $this->markTestSkipped('Skipping due to issue ICU-21661.');
+        }
+
         $instance = static::createFromString($string);
         $instance = $form ? $instance->normalize($form) : $instance;
 
@@ -159,11 +161,13 @@ public static function provideWrap(): array
 
     /**
      * @dataProvider provideLength
-     *
-     * @requires extension intl 66.2
      */
     public function testLength(int $length, string $string)
     {
+        if (2 !== grapheme_strlen('च्छे') && 'अनुच्छेद' === $string) {
+            $this->markTestSkipped('Skipping due to issue ICU-21661.');
+        }
+
         $instance = static::createFromString($string);
 
         $this->assertSame($length, $instance->length());

Tests/AbstractUnicodeTestCase.php

@@ -57,11 +57,13 @@ public static function provideBytesAt(): array
 
     /**
      * @dataProvider provideCodePointsAt
-     *
-     * @requires extension intl 66.2
      */
     public function testCodePointsAt(array $expected, string $string, int $offset, int $form = null)
     {
+        if (2 !== grapheme_strlen('च्छे') && 'नमस्ते' === $string) {
+            $this->markTestSkipped('Skipping due to issue ICU-21661.');
+        }
+
         $instance = static::createFromString($string);
         $instance = $form ? $instance->normalize($form) : $instance;