CI: bump actions/{checkout,setup-python} versions, simplify

Author: ev-br

.github/workflows/lint.yml

@@ -6,15 +6,11 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ["3.10", "3.11"]
-
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
-        python-version: ${{ matrix.python-version }}
+        python-version: "3.10"
     - name: Run pre-commit hook
       uses: pre-commit/[email protected]