build(deps): bump actions/cache from 2.1.6 to 2.1.7

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.6 to 2.1.7.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/compare/v2.1.6...v2.1.7)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-patch
...
Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build.yml

@@ -106,7 +106,7 @@ jobs:
       cache-version: v1
     steps:
       - uses: actions/checkout@v2.4.0
-      - uses: actions/cache@v2.1.6
+      - uses: actions/cache@v2.1.7
         with:
           path: ${{ env.package-dir }}
           key: ${{ runner.os }}-cygwin-${{ env.cache-version }}

.github/workflows/lint.yml

@@ -24,7 +24,7 @@ jobs:
           pip install pre-commit
       - name: Set PY
         run: echo "PY=$(python -VV | sha256sum | cut -d' ' -f1)" >> $GITHUB_ENV
-      - uses: actions/cache@v1
+      - uses: actions/cache@v2.1.7
         with:
           path: ~/.cache/pre-commit
           key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}