fix deprecations with nullable func args in php 8.4 (#477)

Author: d8vjork

Diff for: src/Traits/BuilderCaching.php

@@ -31,7 +31,7 @@ public function withoutGlobalScope($scope)
         return parent::withoutGlobalScope($scope);
     }
 
-    public function withoutGlobalScopes(array $scopes = null)
+    public function withoutGlobalScopes(?array $scopes = null)
     {
         if ($scopes !== null) {
             $this->withoutGlobalScopes = $scopes;

Diff for: src/Traits/ModelCaching.php

@@ -160,7 +160,7 @@ public function scopeDisableCache(EloquentBuilder $query) : EloquentBuilder
 
     public function scopeWithCacheCooldownSeconds(
         EloquentBuilder $query,
-        int $seconds = null
+        ?int $seconds = null
     ) : EloquentBuilder {
         if (! $seconds) {
             $seconds = $this->cacheCooldownSeconds;