Remove space from MySQL healthcheck default options

[Thomascountz]

Fixes an issue caused by a bug in Podman. Arguments with spaces in healthchecks are incorrectly parsed and executed, which causes MySQL TestContainers with default healthchecks to never become healthy.

See: containers/podman#26519

podman inspect healthcheck-test-mysql | jq '.[].Config.Healthcheck'

--- healthcheck_bug.json	2025-06-26 12:12:35
+++ healthcheck_fix.json	2025-06-26 12:12:27
@@ -3,7 +3,8 @@
     "CMD",
     "/usr/bin/mysql",
    "--protocol=TCP",
    "--port=3306",
    "--user=xxx",
    "--password=xxx",
    "healthcheck_test",
    "--silent",
-    "--execute=SELECT",
-    "1;"
+    "--execute=SELECT(1);"
   ],
   "Interval": 1000000000,
   "Timeout": 5000000000,
  "Retries": 5
}