Upgrade to Laravel 9 (#4413)

Co-authored-by: DaneEveritt <dane@daneeveritt.com>

app/Contracts/Repository/SessionRepositoryInterface.php

@@ -7,14 +7,12 @@ use Illuminate\Support\Collection;
 interface SessionRepositoryInterface extends RepositoryInterface
 {
     /**
-     * Return all of the active sessions for a user.
+     * Return all the active sessions for a user.
      */
     public function getUserSessions(int $user): Collection;
 
     /**
      * Delete a session for a given user.
-     *
-     * @return int|null
      */
-    public function deleteUserSession(int $user, string $session);
+    public function deleteUserSession(int $user, string $session): ?int;
 }