👷 bump performance test SDK bundle to v7 (#4614)

Author: thomas-lebeau

test/performance/configuration.ts

@@ -1,4 +1,4 @@
-export const SDK_BUNDLE_URL = 'https://www.datadoghq-browser-agent.com/us1/v6/datadog-rum.js'
+export const SDK_BUNDLE_URL = 'https://www.datadoghq-browser-agent.com/us1/v7/datadog-rum.js'
 export const APPLICATION_ID = '9fa62a5b-8a7e-429d-8466-8b111a4d4693'
 export const CLIENT_TOKEN = 'pubab31fd1ab9d01d2b385a8aa3dd403b1d'
 export const DATADOG_SITE = 'datadoghq.com'