reduce size of resource of benchmark-packages job, resources seem underused:

https://app.circleci.com/pipelines/github/storybookjs/storybook/113893/workflows/052244b4-8873-4b89-806b-885cf66b99a6/jobs/1059651/resources

Author: ndelangen

scripts/ci/common-jobs.ts

@@ -328,7 +328,7 @@ export const benchmarkPackages = defineJob(
   () => ({
     executor: {
       name: 'sb_node_22_classic',
-      class: 'large',
+      class: 'medium+',
     },
     steps: [
       ...workflow.restoreLinux(),