Bump Python version to 3.12

.github/workflows/gatekeeper-build.yml

@@ -15,17 +15,17 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Python 3.11
+    - name: Set up Python 3.12
       uses: actions/setup-python@v4
       with:
-        python-version: '3.11'
+        python-version: '3.12'
     - name: Add conda to system path
       run: |
         # $CONDA is an environment variable pointing to the root of the miniconda directory
         echo $CONDA/bin >> $GITHUB_PATH
     - name: Install dependencies
       run: |
-        conda install -y python=3.11
+        conda install -y python=3.12
         conda env update --file environment-min.yml --name base
     - name: Lint with flake8
       run: |