chore(deps): update actions/cache action to v6 (#77)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -80,7 +80,7 @@ jobs:
         run: echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
 
       - name: Cache pnpm store
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ${{ env.STORE_PATH }}
           key: pnpm-website-${{ runner.os }}-${{ hashFiles('website/pnpm-lock.yaml') }}

.github/workflows/deploy-website.yml

@@ -37,7 +37,7 @@ jobs:
         run: echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
 
       - name: Cache pnpm store
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ${{ env.STORE_PATH }}
           key: pnpm-website-${{ runner.os }}-${{ hashFiles('website/pnpm-lock.yaml') }}