Upgrade CI to ubuntu-24.04 (#21)

Author: benjyw

.github/workflows/pants.yaml

@@ -11,14 +11,14 @@ 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
     steps:
     - uses: actions/checkout@v4
     - uses: pantsbuild/actions/init-pants@v5-scie-pants