chore(version-v3): update version of checkout to 7

[PetitLepton]

This PR changes the version of the underlying checkout action.

To test the result, I created a specific action calling version-v3 in https://github.com/sencrop/to-test-actions.

---
name: Test version from commit

on:
  workflow_dispatch:
    inputs:
      environment:
        description: 'Environment'
        required: true
        default: 'preproduction'
        type: choice
        options:
          - preproduction
          - production

env:
  AWS_DEFAULT_REGION: eu-central-1

jobs:
  version:
    uses: sencrop/github-workflows/.github/workflows/version-v3.yml@865abcf885f95712fbaf1cb1cc8b416be27e3276
    with:
      from: sha
      
  show-version:
    needs: version
    runs-on: ubuntu-latest
    steps:
      - name: Print version
        run: |
          {
            echo "version: ${{ needs.version.outputs.version }}"
            echo "previous_version: ${{ needs.version.outputs.previous_version }}"
          } >> $GITHUB_STEP_SUMMARY

which output the resulting version. A second one was created using @master.

The results are below. The first corresponds to the master branch of this repository. As expected, a message about the version of Node is shown. The second corresponds to this PR. The message disappeared. Both output the same expected result.