Bump actions/cache from 2 to 3 (#1016)

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v2...v3)

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

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

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

.github/workflows/unit_tests.yml

@@ -28,7 +28,7 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
-    - uses: actions/cache@v2
+    - uses: actions/cache@v3
       with:
         path: ${{ env.pythonLocation }}
         key: style-0-${{ env.pythonLocation }}-${{ hashFiles('setup.cfg') }}-${{ hashFiles('test_requirements.txt') }}
@@ -57,7 +57,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
-    - uses: actions/cache@v2
+    - uses: actions/cache@v3
       with:
         path: ${{ env.pythonLocation }}
         key: build-0-${{ env.pythonLocation }}-${{ hashFiles('setup.cfg') }}-${{ hashFiles('test_requirements.txt') }}
@@ -159,7 +159,7 @@ jobs:
       # only do it on other operating systems
       # https://stackoverflow.com/q/61875869/5201771
       if: "matrix.os != 'ubuntu-latest'"
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ${{ env.pythonLocation }}
         key: test-0-${{ env.pythonLocation }}-${{ hashFiles('setup.cfg') }}-${{ hashFiles('test_requirements.txt') }}