Bump actions/cache from 5 to 6

Bumps [actions/cache](https://github.com/actions/cache) from 5 to 6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v5...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/python-package.yml

@@ -25,7 +25,7 @@ jobs:
       uses: actions/checkout@v6
 
     - name: Cache dependencies
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}

.github/workflows/static.yml

@@ -34,7 +34,7 @@ jobs:
           node-version: '24'
 
       - name: Cache node_modules
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: node_modules
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}