Bump actions/cache from v2 to v2.1.4 (#197)

Bumps [actions/cache](https://github.com/actions/cache) from v2 to v2.1.4.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2...26968a0)

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

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

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
           architecture: x64
 
       - name: Pip cache
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           # This path is specific to Ubuntu
           path: ~/.cache/pip
@@ -46,7 +46,7 @@ jobs:
           pip install 'poetry==${{ env.poetry-version }}'
 
       - name: Poetry cache
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ~/.cache/pypoetry/virtualenvs
           key: ${{ runner.os }}-poetry-${{ hashFiles('poetry.lock') }}