[Components] Convert to native return types

Author: wouterj

Slugger/AsciiSlugger.php

@@ -74,10 +74,7 @@ public function __construct(string $defaultLocale = null, array|\Closure $symbol
         $this->symbolsMap = $symbolsMap ?? $this->symbolsMap;
     }
 
-    /**
-     * @return void
-     */
-    public function setLocale(string $locale)
+    public function setLocale(string $locale): void
     {
         $this->defaultLocale = $locale;
     }

UnicodeString.php

@@ -338,10 +338,7 @@ public function startsWith(string|iterable|AbstractString $prefix): bool
         return $prefix === grapheme_extract($this->string, \strlen($prefix), \GRAPHEME_EXTR_MAXBYTES);
     }
 
-    /**
-     * @return void
-     */
-    public function __wakeup()
+    public function __wakeup(): void
     {
         if (!\is_string($this->string)) {
             throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);