Bump actions/cache from 2.1.5 to 2.1.6 (#99)

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)

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -129,7 +129,7 @@ jobs:
         uses: actions/checkout@v2.3.4
       - name: 🏗 Set up build cache
         id: cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: /tmp/.docker-cache
           key:

.github/workflows/deploy.yaml

@@ -72,7 +72,7 @@ jobs:
         uses: actions/checkout@v2.3.4
       - name: 🏗 Set up build cache
         id: cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: /tmp/.docker-cache
           key: