github/workflows: update GitHub actions to latest versions

Fixes deprecation warnings such as:

  Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/setup-python@v4, actions/cache@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

When bumping codecov/codecov-action v3 to v4, we run into [1]. The
changes needed for this change [2] are not clear, yet. Let's stick to
the previous version for now.

[1] codecov/codecov-action#1274
[2] https://about.codecov.io/blog/january-product-update-updating-the-codecov-ci-uploaders-to-the-codecov-cli/

Signed-off-by: Bastian Krause <bst@pengutronix.de>

.github/workflows/build-and-release.yml

@@ -11,7 +11,7 @@ jobs:
       with:
         fetch-depth: 0
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: "3.11"
     - name: Install python dependencies

.github/workflows/reusable-unit-tests.yml

@@ -19,10 +19,10 @@ jobs:
       with:
         ref: ${{ inputs.branch }}
     - name: Set up Python ${{ inputs.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ inputs.python-version }}
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('pyproject.toml') }}