(gha) use 32core runner for "rake checks"

Reduces run time from ~8 mins -> ~5mins.

Author: jhoblitt

.github/workflows/rake_checks.yaml

@@ -13,7 +13,7 @@ jobs:
   rake_checks:
     runs-on:
       group: Default Larger Runners
-      labels: ubuntu-latest-16-cores
+      labels: ubuntu-latest-32-cores
     steps:
       - uses: actions/checkout@v3