Bump actions/cache from 2.1.6 to 2.1.7 (#1679)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/website.yaml

@@ -30,7 +30,7 @@ jobs:
         run: echo "::set-output name=dir::$(yarn cache dir)"
 
       - name: Cache dependencies
-        uses: actions/cache@v2.1.6
+        uses: actions/cache@v2.1.7
         with:
           path: ${{ steps.yarn-cache.outputs.dir }}
           key: ${{ runner.os }}-website-${{ hashFiles('**/yarn.lock') }}