Bump actions/cache from 3 to 4 (#238)

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

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

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-additional.yml

@@ -31,7 +31,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: initialize cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-py${{ matrix.python-version }}-${{ hashFiles('ci/requirements/**.txt') }}

.github/workflows/ci.yml

@@ -55,7 +55,7 @@ jobs:
         fetch-depth: 0  # fetch all branches and tags
 
     - name: cache pip
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: pip-py${{ matrix.python-version }}