point to latest ubuntu image

Author: aaishwarymishra

.github/workflows/tests_full.yaml

@@ -11,7 +11,7 @@ concurrency:
 
 jobs:
   tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: ["3.11", "3.12", "3.13", "3.14"]
@@ -31,10 +31,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python 3.9
+      - name: Set up Python 3.11
         uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: 3.11
       - name: Install Nox
         run: pip install nox==2024.03.02
       - name: Lint