Replace archived gh-actions-cache extension with direct gh command

The functionality has been integrated directly into the `gh` CLI.

See:
- https://github.com/actions/gh-actions-cache

Author: elasticdog

.github/workflows/draft-release-flutter.yml

@@ -92,7 +92,7 @@ jobs:
         name: Create a new GitHub draft release
         if: github.ref_type == 'tag'
         env:
-          GH_TOKEN: ${{ github.token }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           gh release create "${GITHUB_REF_NAME}" \
             --draft \

.github/workflows/draft-release-rust.yml

@@ -34,7 +34,7 @@ jobs:
         name: Create a new GitHub draft release
         if: github.ref_type == 'tag'
         env:
-          GH_TOKEN: ${{ github.token }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           gh release create "${GITHUB_REF_NAME}" \
             --draft \

.github/workflows/flush-caches.yml

@@ -19,11 +19,7 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          gh extension install actions/gh-actions-cache
-          REPO="${{ github.repository }}"
-          BRANCH="${GITHUB_REF}"
-          cache_keys=$(gh actions-cache list -R "$REPO" -B "$BRANCH" | cut -f 1)
-          set +e
-          for key in $cache_keys; do
-            gh actions-cache delete "$key" -R "$REPO" -B "$BRANCH" --confirm
-          done
+          gh cache delete --all \
+            --repo "${{ github.repository }}" \
+            --ref "${{ github.ref }}" \
+            --succeed-on-no-caches