fix: Skip projen post synth actions causing yarn lockfile issues

update_cdk_version_in_projen.sh

@@ -22,7 +22,7 @@ else
   sed -i "s/cdkVersion: '$local_version'/cdkVersion: '$release_version'/g" .projenrc.js
   # # remove the lock file so we can update appropriately for the new CDK version
   # rm yarn.lock
-  if npx projen && npx jest test; then
+  if npx projen --no-post && yarn install && npx jest test; then
     echo "CDK version upgraded successfully"
   else
     echo "CDK version upgrade failed"