chore(deps): update withastro/action action to v6

Author: renovate[bot]

.github/workflows/deploy.yaml

@@ -21,7 +21,7 @@ jobs:
       - name: Checkout your repository using git
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Install, build, and upload your site output
-        uses: withastro/action@fc88a7002f0c62327f26fb1b15f2a1d581249278 # v5.1.0
+        uses: withastro/action@44706356b4eb735f8b9035699eb4796241a040c4 # v6.1.0
         with:
             path: ./ # The root location of your Astro project inside the repository. (optional)
             node-version: 23 # The specific version of Node that should be used to build your site. Defaults to 18. (optional)