Set up Python 3.14 in lint-toolchain workflow

Add step to set up Python 3.14 in the workflow

Author: sbryngelson

.github/workflows/lint-toolchain.yml

@@ -10,6 +10,11 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
+    - name: Set up Python 3.14
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.14'
+
     - name: MFC Python setup
       run: ./mfc.sh init