bump to a recent python?

Author: cburroughs

.github/workflows/pants.yaml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.12]
     steps:
     - uses: actions/checkout@v4
     - uses: actions/setup-python@v4