Wrangle with lint stage

Author: Ickerday

.github/workflows/lint.yml

@@ -1,14 +1,17 @@
 name: Python SDK Lint
 on: [push, workflow_dispatch]
 
+env:
+  PYTHON_VERSION: 3.9
+
 jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - uses: ./.github/actions/setup-sdk-environment
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: ${{ env.PYTHON_VERSION }}
           deps-group: lint
       - name: Verify uv.lock is up-to-date
         run: uv lock --check