reduce number of codebuild macos runners (#1104)

Signed-off-by: Swapnanil-Gupta <swpnlg@amazon.com>

Author: Swapnanil-Gupta

lib/utils.ts

@@ -4,9 +4,9 @@ import { EnvConfig } from '../config/env-config';
 export const getMacBaseCapacityForAccount = (accountId?: string): number => {
   switch (accountId) {
     case EnvConfig.envRelease.account:
-      return 3;
+      return 2;
     case EnvConfig.envProd.account:
-      return 3;
+      return 2;
     default:
       return 1;
   }