PR action: update python version

Author: tschaume

.github/workflows/pull-request.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.11"]
 
     steps:
       - uses: actions/checkout@v4
@@ -46,7 +46,7 @@ jobs:
           PERCY_TOKEN: ${{ secrets.PERCY_TOKEN }}
         run: python${{ matrix.python-version }} -m pytest --cov=crystal_toolkit --cov-report=xml --color=yes --webdriver Chrome --headless crystal_toolkit/apps/examples/tests/
       - uses: codecov/codecov-action@v1
-        if: matrix.python-version == 3.10
+        if: matrix.python-version == 3.11
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage.xml