fix: support dropping privileges with arbitrary users (#18386)

fixes #18380

buildscripts/upgrade-tests/compose.yml

@@ -9,11 +9,6 @@ x-minio-common: &minio-common
   expose:
     - "9000"
     - "9001"
-  healthcheck:
-    test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
-    interval: 30s
-    timeout: 20s
-    retries: 3
 
 # starts 4 docker containers running minio server instances.
 # using nginx reverse proxy, load balancing, you can access