chore(deps): bump actions/cache from 4 to 5 in ci.yml

Sync ci.yml with release.yml after dependabot updates.

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
         run: echo "path=$(pnpm store path --silent)" >> $GITHUB_OUTPUT
 
       - name: Cache pnpm store
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ${{ steps.pnpm-store.outputs.path }}
           key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
@@ -77,7 +77,7 @@ jobs:
             || sudo apt-get install -y --no-install-recommends libsoup2.4-dev
 
       - name: Cache Cargo registry and build
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cargo/registry