Bump actions/cache from 5 to 6 (#1619)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -39,7 +39,7 @@ jobs:
 
     - name: Restore Python ${{ steps.python.outputs.python-version }} virtual environment
       id: cache-venv
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: venv
         key: >-
@@ -112,7 +112,7 @@ jobs:
 
     - name: Restore Python ${{ steps.python.outputs.python-version }} virtual environment
       id: cache-venv
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: venv
         key: >-
@@ -153,7 +153,7 @@ jobs:
 
     - name: Restore cached PMS Docker image
       id: docker-cache
-      uses: actions/cache/restore@v5
+      uses: actions/cache/restore@v6
       with:
         path: ~/.cache/docker/plexinc
         key: ${{ runner.os }}-docker-pms-${{ steps.docker-digest.outputs.digest }}
@@ -228,7 +228,7 @@ jobs:
 
     - name: Save PMS Docker image cache
       if: always() && steps.docker-cache.outputs.cache-hit != 'true'
-      uses: actions/cache/save@v5
+      uses: actions/cache/save@v6
       with:
         key: ${{ steps.docker-cache.outputs.cache-primary-key }}
         path: ~/.cache/docker/plexinc
@@ -267,7 +267,7 @@ jobs:
 
     - name: Restore Python ${{ steps.python.outputs.python-version }} virtual environment
       id: cache-venv
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: venv
         key: >-

.github/workflows/refresh_token.yml

@@ -25,7 +25,7 @@ jobs:
 
     - name: Restore Python ${{ steps.python.outputs.python-version }} virtual environment
       id: cache-venv
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: venv
         key: >-