ci: larger runner size with more memory for generate workflow

Author: abuchanan-airbyte

.github/workflows/speakeasy_sdk_generation.yml

@@ -14,6 +14,7 @@ permissions:
 jobs:
     generate:
         uses: speakeasy-api/sdk-generation-action/.github/workflows/workflow-executor.yaml@v15
+        runs-on: ubuntu-latest-16core
         with:
             force: ${{ github.event.inputs.force }}
             mode: pr