chore(deps): update grafana/k6 docker tag to v1.2.1

Author: renovate[bot]

.ops/performance-test/docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   performance-test:
-    image: grafana/k6:1.1.0
+    image: grafana/k6:1.2.1
     volumes:
       - .:/app
     user: ${USER_ID:-1000}