ci: bump actions/cache from 4 to 5

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] <[email protected]>

Author: dependabot[bot]

.github/workflows/build_examples.yaml

@@ -48,7 +48,7 @@ jobs:
         uses: arduino/[email protected]
 
       - name: Restore Arduino platforms
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         id: restore_platforms
         with:
           path: |
@@ -64,7 +64,7 @@ jobs:
           sh continuous_integration/install-platforms-arduino-cli.sh
 
       - name: Restore Arduino libraries
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         id: restore_libraries
         if: ${{ steps.check_lib_install.outputs.valid_lib_dep_script == 'true'}}
         with:
@@ -327,7 +327,7 @@ jobs:
           arduino-cli --config-file continuous_integration/arduino_cli.yaml lib uninstall ${GITHUB_REPOSITORY#*/}
 
       - name: Cache Arduino platforms
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         id: cache_platforms
         if: ${{ always() }}
         with:
@@ -336,7 +336,7 @@ jobs:
           key: ${{ steps.restore_platforms.outputs.cache-primary-key }}
 
       - name: Cache Arduino libraries
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         id: cache_libraries
         if: ${{ always() && steps.check_lib_install.outputs.valid_lib_dep_script == 'true'}}
         with:
@@ -363,7 +363,7 @@ jobs:
         uses: EnviroDIY/[email protected]
 
       - name: Restore PlatformIO platforms
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         id: restore_platforms
         with:
           path: |
@@ -381,7 +381,7 @@ jobs:
           sh continuous_integration/install-platforms-platformio.sh
 
       - name: Restore PlatformIO libraries
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         id: restore_libraries
         if: ${{ steps.check_lib_install.outputs.valid_lib_dep_script == 'true'}}
         with:
@@ -531,7 +531,7 @@ jobs:
           pio pkg uninstall --skip-dependencies -g --library LoRa_AT
 
       - name: Cache PlatformIO platforms
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         id: cache_platforms
         if: ${{ always() }}
         with:
@@ -542,7 +542,7 @@ jobs:
           key: ${{ steps.restore_platforms.outputs.cache-primary-key }}
 
       - name: Cache PlatformIO libraries
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         id: cache_libraries
         if: ${{ always() && steps.check_lib_install.outputs.valid_lib_dep_script == 'true'}}
         with: