fix: expand date in auto-dependency PR body using step output

[Copilot]

$(date +%Y-%m-%d) in the body: field of peter-evans/create-pull-request is a plain YAML string — shell substitution never runs, so PR #145's description showed the literal text instead of the actual date.

Changes

• Added Get current date step before Create Pull Request that writes the date to $GITHUB_OUTPUT
• Updated PR body to reference ${{ steps.get_date.outputs.date }} instead of the unexpanded shell substitution

- name: Get current date
  id: get_date
  run: echo "date=$(date +%Y-%m-%d)" >> "$GITHUB_OUTPUT"

- name: Create Pull Request
  uses: peter-evans/create-pull-request@v6
  with:
    body: |
      Mise à jour automatique des dépendances npm effectuée le ${{ steps.get_date.outputs.date }}

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[Copilot]

Pull request overview

This PR fixes the auto-dependency workflow’s pull request description so the current date is actually expanded (instead of showing a literal $(date +%Y-%m-%d)), by capturing the date in a prior step and reusing it via step outputs.

Changes:

• Added a Get current date step that writes a date output to $GITHUB_OUTPUT.
• Updated the peter-evans/create-pull-request body: to use ${{ steps.get_date.outputs.date }}.

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