build(deps): bump actions/cache from 4 to 5 (#102)

Author: XavierBerger

.github/workflows/esphome-ci.yaml

@@ -74,7 +74,7 @@ jobs:
           echo "ESPHome version: $VERSION"
 
       - name: 💾 Cache PlatformIO & ESPHome (shared)
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/pip