✅(e2e) fix flakiness

Some tests were getting very flaky due to previous
tests updates. This should fix it.

src/frontend/apps/e2e/__tests__/app-impress/doc-header.spec.ts

@@ -438,7 +438,9 @@ test.describe('Doc Header', () => {
 
     // Pin
     await page.getByText('push_pin').click();
-    await page.getByLabel('Open the document options').click();
+    await page
+      .getByRole('button', { name: 'Open the document options' })
+      .click();
     await expect(page.getByText('Unpin')).toBeVisible();
 
     await page.goto('/');