Bump actions/cache from 3 to 4 (#951)

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.yaml

@@ -13,7 +13,7 @@ jobs:
           python-version: "3.12"
       - name: Install poetry
         run: pipx install poetry
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: .venv
           key: poetry-${{ steps.setup-python.outputs.python-version}}-${{ hashFiles('poetry.lock') }}
@@ -32,7 +32,7 @@ jobs:
         run: sudo apt-get install -y pandoc
       - name: Install poetry
         run: pipx install poetry
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: .venv
           key: poetry-${{ steps.setup-python.outputs.python-version}}-${{ hashFiles('poetry.lock') }}