minor #276 PHP8.5 Fix #1 (Jas-n)

This PR was merged into the main branch.

Discussion
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PHP8.5 Fix #1

Fixes: Method SplObjectStorage::attach() is deprecated since 8.5, use method SplObjectStorage::offsetSet() instead

Commits
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59636f7 Fixes: Method SplObjectStorage::attach() is deprecated since 8.5, use method SplObjectStorage::offsetSet() instead

Author: fabpot

src/Pimple/Container.php

@@ -174,7 +174,7 @@ public function factory($callable)
             throw new ExpectedInvokableException('Service definition is not a Closure or invokable object.');
         }
 
-        $this->factories->attach($callable);
+        $this->factories->offsetSet($callable);
 
         return $callable;
     }