Bump actions/setup-python from 5.3.0 to 5.4.0

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5.3.0 to 5.4.0.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v5.3.0...v5.4.0)

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

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

Author: dependabot[bot]

.github/workflows/python-app.yml

@@ -24,7 +24,7 @@ jobs:
         /sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -screen 0 1920x1200x24 -ac +extension GLX
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5.3.0
+      uses: actions/setup-python@v5.4.0
       with:
         python-version: ${{ matrix.python-version }}
     - uses: ./.github/actions/install-dependencies-and-plottr

.github/workflows/python-release.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python
-      uses: actions/setup-python@v5.3.0
+      uses: actions/setup-python@v5.4.0
       with:
         python-version: '3.9'
     - uses: ./.github/actions/install-dependencies-and-plottr