Bump actions/cache from 2.1.4 to 2.1.7 (#1422)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.4 to 2.1.7.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.4...v2.1.7)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -38,7 +38,7 @@ jobs:
           'requirements_test_brain.txt', 'requirements_test_pre_commit.txt') }}"
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: venv
           key: >-
@@ -61,7 +61,7 @@ jobs:
             hashFiles('.pre-commit-config.yaml') }}"
       - name: Restore pre-commit environment
         id: cache-precommit
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: ${{ env.PRE_COMMIT_CACHE }}
           key: >-
@@ -89,7 +89,7 @@ jobs:
           python-version: ${{ env.DEFAULT_PYTHON }}
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: venv
           key:
@@ -102,7 +102,7 @@ jobs:
           exit 1
       - name: Restore pre-commit environment
         id: cache-precommit
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: ${{ env.PRE_COMMIT_CACHE }}
           key: ${{ runner.os }}-${{ needs.prepare-base.outputs.pre-commit-key }}
@@ -144,7 +144,7 @@ jobs:
           'requirements_test_brain.txt') }}"
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: venv
           key: >-
@@ -180,7 +180,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: venv
           key:
@@ -221,7 +221,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: venv
           key:
@@ -273,7 +273,7 @@ jobs:
           'requirements_test_brain.txt') }}"
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: venv
           key: >-
@@ -313,7 +313,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: venv
           key:
@@ -355,7 +355,7 @@ jobs:
             hashFiles('setup.cfg', 'requirements_test_min.txt') }}"
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: venv
           key: >-
@@ -391,7 +391,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].4
+        uses: actions/[email protected].7
         with:
           path: venv
           key: