Merge branch '5.0' into 5.1

* 5.0:
  [String] Added a help message when translation-contracts is not installed
  Add: ExcludeList usage for PHPUnit 9.4
  [Cache] Fix compat wth DBAL v3
  [String] throw when Alpine is used and translit fails

Author: nicolas-grekas

AbstractUnicodeString.php

@@ -140,8 +140,10 @@ public function ascii(array $rules = []): self
             } elseif (ICONV_IMPL === 'glibc') {
                 $s = iconv('UTF-8', 'ASCII//TRANSLIT', $s);
             } else {
-                $s = preg_replace_callback('/[^\x00-\x7F]/u', static function ($c) {
-                    $c = iconv('UTF-8', 'ASCII//IGNORE//TRANSLIT', $c[0]);
+                $s = @preg_replace_callback('/[^\x00-\x7F]/u', static function ($c) {
+                    if ('' === $c = (string) iconv('UTF-8', 'ASCII//IGNORE//TRANSLIT', $c[0])) {
+                        throw new \LogicException(sprintf('"%s" requires a translit-able iconv implementation, try installing "gnu-libiconv" if you\'re using Alpine Linux.', static::class));
+                    }
 
                     return 1 < \strlen($c) ? ltrim($c, '\'`"^~') : (\strlen($c) ? $c : '?');
                 }, $s);

Slugger/AsciiSlugger.php

@@ -15,6 +15,10 @@
 use Symfony\Component\String\UnicodeString;
 use Symfony\Contracts\Translation\LocaleAwareInterface;
 
+if (!interface_exists(LocaleAwareInterface::class)) {
+    throw new \LogicException('You cannot use the "Symfony\Component\String\Slugger\AsciiSlugger" as the "symfony/translation-contracts" package is not installed. Try running "composer require symfony/translation-contracts".');
+}
+
 /**
  * @author Titouan Galopin <[email protected]>
  */