Update actions/cache action to v3.0.8

Author: renovate[bot]

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           node-version: 15.12.0
 
-      - uses: actions/cache@a7c34adf76222e77931dedbf4a45b2e4648ced19 # tag=v3.0.7
+      - uses: actions/cache@fd5de65bc895cf536527842281bea11763fefd77 # tag=v3.0.8
         with:
           path: node_modules
           key: npm-${{ hashFiles('package-lock.json') }}