Bump actions/cache from 4 to 5 (#755)

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/ci.yml

@@ -45,7 +45,7 @@ jobs:
         #----------------------------------------------
       - name: Load cached venv
         id: cached-poetry-dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: .venv
           key: venv-${{ runner.os }}-${{ env.pythonversion }}-${{ hashFiles('**/poetry.lock') }}
@@ -117,7 +117,7 @@ jobs:
         #----------------------------------------------
       - name: Load cached venv
         id: cached-poetry-dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: .venv
           key: venv-${{ runner.os }}-${{ matrix.pyver }}-${{ hashFiles('**/poetry.lock') }}

.github/workflows/docs-pages.yml

@@ -36,7 +36,7 @@ jobs:
 
       - name: Load cached venv
         id: cached-poetry-dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: .venv
           key: venv-${{ runner.os }}-${{ hashFiles('**/poetry.lock') }}

.github/workflows/pypi-publish.yaml

@@ -32,7 +32,7 @@ jobs:
           python-version: 3.9
 
       - name: Cache Poetry virtualenv
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         id: cache
         with:
           path: ~/.virtualenvs