Bump withastro/action from 5 to 6 in the all group (#20)

Bumps the all group with 1 update: [withastro/action](https://github.com/withastro/action).


Updates `withastro/action` from 5 to 6
- [Release notes](https://github.com/withastro/action/releases)
- [Commits](withastro/action@v5...v6)

---
updated-dependencies:
- dependency-name: withastro/action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all
...

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

Author: dependabot[bot]

.github/workflows/gh_pages_deployment.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Checkout your repository using git
         uses: actions/checkout@v6
       - name: Install, build, and upload your site
-        uses: withastro/action@v5
+        uses: withastro/action@v6
         with:
           # path: ./docs # The root location of your Astro project inside the repository. (optional)
           node-version: 20 # The specific version of Node that should be used to build your site. Defaults to 18. (optional)