ci: only run pylint on a single Python version

.github/workflows/pylint.yml

@@ -1,19 +1,27 @@
 name: Pylint
 
-on: [push]
+on:
+  push:
+    branches: [ main ]
+    paths:
+    - 'l2gv2/**/*.py'
+    - '.github/workflows/pylint.yml'
+  pull_request:
+    branches: [ main ]
+    paths:
+    - 'tests/**/*.py'
+    - '.github/workflows/pylint.yml'
 
 jobs:
   build:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v5
       with:
-        python-version: ${{ matrix.python-version }}
+        python-version: "3.10"
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip