Update pull-request.yml

Change python-version only [3.11]

Author: ethanleelge

.github/workflows/pull-request.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.10, 3.11, 3.12]
+        python-version: [3.11]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}