[8.x] Fix typehints on cache repositories (#40250)

* Fix typehints on cache repositories

* Update Repository.php

Co-authored-by: Taylor Otwell <[email protected]>

Author: driesvints

src/Illuminate/Cache/Repository.php

@@ -578,7 +578,7 @@ public function getStore()
     /**
      * Fire an event for this cache instance.
      *
-     * @param  string  $event
+     * @param  object|string  $event
      * @return void
      */
     protected function event($event)

src/Illuminate/Cache/TaggedCache.php

@@ -105,7 +105,7 @@ public function taggedItemKey($key)
     /**
      * Fire an event for this cache instance.
      *
-     * @param  string  $event
+     * @param  \Illuminate\Cache\Events\CacheEvent  $event
      * @return void
      */
     protected function event($event)