CI: bump the other job to ubuntu-latest

Author: tacaswell

.github/workflows/main.yaml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/setup-python@v5
       - uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     permissions:
       contents: write