Bump actions/cache from 3 to 4

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]>

.github/workflows/automated-tests.yml

@@ -55,7 +55,7 @@ jobs:
           sudo apt-get install -y gettext libgettextpo-dev libmariadb-dev-compat libmariadb-dev
 
       - name: Cached dependencies & virtualenv
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/.cache/pypoetry/
@@ -140,7 +140,7 @@ jobs:
           sudo apt-get install -y gettext libgettextpo-dev libmariadb-dev-compat libmariadb-dev
 
       - name: Cached dependencies & virtualenv
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/.cache/pypoetry/