Bump withastro/action from 3 to 4 (#70)

Bumps [withastro/action](https://github.com/withastro/action) from 3 to 4.
- [Release notes](https://github.com/withastro/action/releases)
- [Commits](withastro/action@v3...v4)

---
updated-dependencies:
- dependency-name: withastro/action
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Max Ostapenko <1611259+max-ostapenko@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/deploy.yml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install, build, and upload your site
-        uses: withastro/action@v3
+        uses: withastro/action@v4
         # with:
             # path: . # The root location of your Astro project inside the repository. (optional)
             # node-version: 16 # The specific version of Node that should be used to build your site. Defaults to 16. (optional)