ci: Update to actions/checkout@v3 and actions/setup-python@v4

Silences some NodeJS 12 action deprecation warnings.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

.github/workflows/master.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
       - name: Identify release build

.github/workflows/next.yml

@@ -20,9 +20,9 @@ jobs:
         python-version: ["3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
     steps:
       - name: Check out repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
           architecture: x64
@@ -67,7 +67,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
       - name: Set up Docker Buildx

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Get release
         run: echo "RELEASE_VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
       - name: Set up QEMU