ci: set up python for lint job

Author: mrjf

.github/workflows/ci.yml

@@ -21,6 +21,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
       - uses: astral-sh/setup-uv@v6
         with:
           enable-cache: true
@@ -81,4 +85,3 @@ jobs:
       - name: Run Go tests
         if: hashFiles('go.mod') != ''
         run: go test ./...
-