Replace tibdex/github-app-token with actions/create-github-app-token

[Copilot]

The tibdex/github-app-token action has been archived and is no longer maintained. This PR replaces all usages with the officially supported actions/create-github-app-token@v2 action.

Changes Made

Updated 3 workflow files to use the new action:

• .github/workflows/addToProject.yml
• .github/workflows/labeler.yml
• .github/workflows/update-specs.yml

Configuration Migration

The following transformations were applied consistently across all workflows:

Action Reference:

# Before
uses: tibdex/github-app-token@3beb63f4bd073e61482598c45c71c1019b59b73a

# After  
uses: actions/create-github-app-token@v2

Parameter Names:

# Before
app_id: ${{ secrets.OBS_AUTOMATION_APP_ID }}
private_key: ${{ secrets.OBS_AUTOMATION_APP_PEM }}

# After
app-id: ${{ secrets.OBS_AUTOMATION_APP_ID }}
private-key: ${{ secrets.OBS_AUTOMATION_APP_PEM }}

Permissions Format:

# Before
permissions: >-
  {
    "contents": "write",
    "pull_requests": "write"
  }

# After
permission-contents: write
permission-pull-requests: write

All functionality remains identical - the workflows will continue to operate exactly as before but now use the supported GitHub Actions official action instead of the archived third-party action.

Fixes #183.

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