build: Update GitHub Actions checkout and withastro actions to v5.

Author: osamajandali

.github/workflows/deploy.yml

@@ -19,9 +19,9 @@ jobs:
       name: github-pages
     steps:
       - name: Checkout your repository using git
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Install, build, and upload your site
-        uses: withastro/action@v3
+        uses: withastro/action@v5
         env:
           NOTION_TOKEN: ${{ secrets.NOTION_TOKEN }}
           NOTION_MEMBERS_DATABASE_ID: ${{ secrets.NOTION_MEMBERS_DATABASE_ID }}