Updates to new runners

Author: azrosen92

.github/workflows/sdk_generation.yaml

@@ -19,11 +19,12 @@ permissions:
     - cron: 0 0 * * *
 jobs:
   generate:
-    uses: speakeasy-api/sdk-generation-action/.github/workflows/workflow-executor.yaml@v15
+    uses: Gusto/sdk-generation-action/.github/workflows/workflow-executor.yaml@main
     with:
       force: ${{ github.event.inputs.force }}
       mode: pr
       set_version: ${{ github.event.inputs.set_version }}
+      runs-on: "{\"group\": \"gusto-ubuntu-default\"}"
     secrets:
       github_access_token: ${{ secrets.GITHUB_TOKEN }}
       openapi_doc_auth_token: ${{ secrets.OPENAPI_DOC_AUTH_TOKEN }}