[github-actions]: Bump withastro/action from 2 to 3

Bumps [withastro/action](https://github.com/withastro/action) from 2 to 3.
- [Release notes](https://github.com/withastro/action/releases)
- [Commits](withastro/action@v2...v3)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/docs.yml

@@ -20,7 +20,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install, build, and upload your site
-        uses: withastro/action@v2
+        uses: withastro/action@v3
         with:
           path: docs