Bump actions/cache from 2.1.5 to 2.1.6

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.5...v2.1.6)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
           node-version: '14.x'
       - uses: actions/checkout@v2.3.4
       - id: cache-npm
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('package-lock.json') }}
@@ -48,7 +48,7 @@ jobs:
     steps:
       - uses: actions/setup-python@v2.2.2
       - uses: actions/checkout@v2.3.4
-      - uses: actions/cache@v2.1.5
+      - uses: actions/cache@v2.1.6
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('linter-requirements.txt') }}