Merge pull request #392 from o2sh/dependabot/github_actions/actions/cache-v2.1.4

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Restore cargo cache
-      uses: actions/cache@v2
+      uses: actions/cache@v2.1.4
       with:
         path: |
           ~/.cargo/registry