gh-actions: bump actions/setup-python to v5

See https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

.github/workflows/release-test.yml

@@ -106,7 +106,7 @@ jobs:
         fetch-depth: 1
         ref: ${{ github.event.inputs.riot_version }}
     - name: Set up Python 3.8
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: 3.8
     - name: Install Python dependencies

.github/workflows/test-on-iotlab.yml

@@ -88,7 +88,7 @@ jobs:
       TEST_PERIPH_TIMER_PERIODIC_PRECISION: 0.30
     steps:
       - name: Set up Python 3.8
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: 3.8
       - name: Install Python dependencies

.github/workflows/tools-test.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
     - uses: actions/checkout@main
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
         python-version: 3.8
     - name: Install dependencies