ci: 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/ci.yml

@@ -20,7 +20,7 @@ jobs:
         run: pip install platformio
 
       - name: Cache PlatformIO
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: |
             ~/.platformio
@@ -53,7 +53,7 @@ jobs:
         run: sudo apt-get update && sudo apt-get install -y libsdl2-dev
 
       - name: Cache PlatformIO
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: |
             ~/.platformio

.github/workflows/release.yml

@@ -41,7 +41,7 @@ jobs:
         run: pip install platformio
 
       - name: Cache PlatformIO
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: |
             ~/.platformio