Update .env.testing

Author: KOSASIH

config/.env.testing

@@ -18,7 +18,7 @@ FEATURE_ENABLE_NEW_UI=false
 FEATURE_ENABLE_EXPERIMENTAL_FEATURE=true
 
 # Third-party Service Keys (mocked for testing)
-STRIPE_SECRET_KEY=sk_test_mocked
+STRIPE_SECRET_KEY= "SECRET KEY"
 SENDGRID_API_KEY=SG.mocked
 
 # CORS Configuration