github/workflows: Bump actions/setup-python from 1 or 2 to 4.

Bumps [actions/setup-python](https://github.com/actions/setup-python) from
1 or 2 to 4.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v2...v4)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/code_formatting.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v4
     - name: Install packages
       run: source tools/ci.sh && ci_code_formatting_setup
     - name: Run code formatting

.github/workflows/commit_formatting.yml

@@ -9,6 +9,6 @@ jobs:
     - uses: actions/checkout@v3
       with:
         fetch-depth: '100'
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v4
     - name: Check commit message formatting
       run: source tools/ci.sh && ci_commit_formatting_run

.github/workflows/docs.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v4
     - name: Install Python packages
       run: pip install Sphinx
     - name: Build docs

.github/workflows/ports_unix.yml

@@ -178,7 +178,7 @@ jobs:
     runs-on: macos-11.0
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/setup-python@v2
+    - uses: actions/setup-python@v4
       with:
         python-version: '3.8'
     - name: Build