Updating github workflow

Author: MichaelClerx

.github/workflows/tests.yml

@@ -28,12 +28,12 @@ jobs:
     - name: Check code style with flake8
       run: |
         python -m flake8 pcpostprocess/*.py tests/*.py pcpostprocess/scripts/*.py
-      if: matrix.python-version == ${{ python-latest }}
+      if: matrix.python-version == ${{ python_latest }}
 
     - name: Check import ordering with isort
       run: |
         python -m isort --verbose --check-only --diff pcpostprocess tests setup.py
-      if: matrix.python-version == ${{ python-latest }}
+      if: matrix.python-version == ${{ python_latest }}
 
     - name: Extract test data
       run: |
@@ -56,5 +56,5 @@ jobs:
         pcpostprocess run_herg_qc tests/test_data/13112023_MW2_FF -w A01 A02 A03
 
     - uses: codecov/codecov-action@v4
-      if: success() && matrix.python-version == ${{ python-latest }}
+      if: success() && matrix.python-version == ${{ python_latest }}