Upgrade CI to ubuntu-24.04 (pantsbuild#22)

Author: benjyw

.github/workflows/pants.yaml

@@ -11,15 +11,15 @@ jobs:
   org-check:
     name: Check GitHub Organization
     if: ${{ github.repository_owner == 'pantsbuild' }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Noop
         run: "true"
 
   build:
     name: Perform CI Checks
     needs: org-check
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         python-version: [3.8]