build(deps): bump actions/cache from 4 to 5 (#424)

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  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>

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -26,7 +26,7 @@ jobs:
           poetry-version: ${{ env.POETRY_VERSION }}
 
       - name: Restore & Cache Poetry and Dependences
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         id: poetry-cache
         with:
           path: |

.github/workflows/document-test.yml

@@ -49,7 +49,7 @@ jobs:
         run: ${{ env.CXX }} --version
 
       - name: Restore & Cache {fmt}
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         id: fmt-cache
         with:
           path: ${{ runner.temp }}/libs/fmt