fix(ci): pin + cache

.github/workflows/lint.yml

@@ -10,15 +10,17 @@ jobs:
   pre-commit-ci:
     name: Pre-Commit
     runs-on: [self-hosted, Linux, x64]
+    env:
+      PYTHON_VERSION: "3.10"
 
     steps:
       - name: Check out the codebase
         uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # 3.0.2
 
-      - name: Set up Python 3.x
+      - name: Set up Python ${{ env.PYTHON_VERSION }}
         uses: actions/setup-python@13ae5bb136fac2878aff31522b9efb785519f984 # 4.3.0
         with:
-          python-version: "3.x"
+          python-version: ${{ env.PYTHON_VERSION }}
           cache: 'pip' # caching pip dependencies