minor #1763 remove duplicate key (tacman)

This PR was merged into the 2.x branch.

Discussion
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remove duplicate key

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Issues        | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

First key was ignored

Commits
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1f8af4e remove duplicate key

Author: kbond

src/StimulusBundle/tests/Twig/StimulusTwigExtensionTest.php

@@ -205,7 +205,6 @@ public static function provideRenderStimulusAction(): iterable
             'actionName' => 'onClick',
             'eventName' => null,
             'parameters' => ['boolParam' => true, 'intParam' => 4, 'stringParam' => 'test'],
-            'expectedString' => 'data-action="onClick"',
             'expectedString' => 'data-action="my-controller#onClick" data-my-controller-bool-param-param="true" data-my-controller-int-param-param="4" data-my-controller-string-param-param="test"',
             'expectedArray' => ['data-action' => 'my-controller#onClick', 'data-my-controller-bool-param-param' => 'true', 'data-my-controller-int-param-param' => '4', 'data-my-controller-string-param-param' => 'test'],
         ];