Upgrade CI to ubuntu-24.04 (#43)

Author: benjyw

.github/workflows/pants.yaml

@@ -8,7 +8,7 @@ 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"
@@ -17,7 +17,7 @@ jobs:
     needs: org-check
     env:
       PANTS_CONFIG_FILES: pants.ci.toml
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         python-version: [3.9]