build(deps): bump graycoreio/github-actions-magento2 from 8.2.0 to 8.4.0 (#37)

Bumps [graycoreio/github-actions-magento2](https://github.com/graycoreio/github-actions-magento2) from 8.2.0 to 8.4.0.
- [Release notes](https://github.com/graycoreio/github-actions-magento2/releases)
- [Changelog](https://github.com/graycoreio/github-actions-magento2/blob/main/CHANGELOG.md)
- [Commits](graycoreio/github-actions-magento2@v8.2.0...v8.4.0)

---
updated-dependencies:
- dependency-name: graycoreio/github-actions-magento2
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/check-extension.yaml

@@ -27,7 +27,7 @@ jobs:
       outputs:
         matrix: ${{ steps.supported-version.outputs.matrix }}
       steps:
-        - uses: graycoreio/github-actions-magento2/supported-version@v8.2.0
+        - uses: graycoreio/github-actions-magento2/supported-version@v8.4.0
           id: supported-version
           with:
               include_services: true