Fix linter by using recent Python version

We have no particular reason to use 3.7 for this anymore

Author: AlexanderWells-diamond

.github/workflows/code.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.7"
+          python-version: "3.12"
 
       - name: Install Python Dependencies
         run: pip install flake8