Bump action versions

Signed-off-by: Sara Damiano <sdamiano@stroudcenter.org>

.github/workflows/build_examples_platformio.yaml

@@ -53,7 +53,7 @@ jobs:
             example: examples/MqttClient
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set variables
         run: |
@@ -66,7 +66,7 @@ jobs:
           fi
 
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: '3.x'
 
@@ -77,7 +77,7 @@ jobs:
           pip install --upgrade platformio
 
       - name: Restore or Cache Platforms and Libraries
-        uses: actions/cache@v3.3.1
+        uses: actions/cache@v4
         id: cache_pio
         with:
           path: ~/.platformio