fix: valid event for required-zizmor workflow

[Mehdi-Bl]

Replace invalid merge_queue event with merge_group so required workflow runs and can satisfy org rulesets.

Summary by Sourcery

CI:

• Replace the deprecated or invalid merge_queue trigger with merge_group in the required Zizmor workflow configuration.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the required-zizmor GitHub Actions workflow to listen to the correct merge queue–related event so it can be used as a required check under org rulesets.

Sequence diagram for merge_group event triggering required-zizmor workflow

sequenceDiagram
  actor Developer
  participant GitHub
  participant MergeQueue
  participant RequiredZizmorWorkflow
  participant OrgRuleset

  Developer->>GitHub: Create or update pull request
  Developer->>MergeQueue: Request enqueue for merge
  MergeQueue->>GitHub: Schedule merge_group
  GitHub-->>RequiredZizmorWorkflow: Trigger on merge_group event
  RequiredZizmorWorkflow->>RequiredZizmorWorkflow: Run Zizmor scan job
  RequiredZizmorWorkflow-->>GitHub: Report check run status
  GitHub-->>OrgRuleset: Provide required-zizmor status
  OrgRuleset-->>GitHub: Evaluate ruleset outcome
  GitHub-->>Developer: Allow or block merge based on required-zizmor

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File-Level Changes

Change	Details	Files
Correct the GitHub Actions event that triggers the required Zizmor workflow for merge queue operations.	Replace the deprecated/invalid merge_queue event trigger with merge_group under the workflow on: section Maintain existing pull_request and workflow_call triggers without modification	.github/workflows/required-zizmor.yml

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