Event Scheduler memory leak

Coming from: https://bugs.mysql.com/bug.php?id=99157 and https://jira.percona.com/browse/PS-6961

I have been done the same tests as reported on https://jira.percona.com/browse/PS-6961 with a host that has no activity apart from these events.
After 3 days the memory increased from:
First number: VIRT column reported on top
Second number: RES column reported on top

407.2g  68.4g

to

410.6g  71.7g

After stopping the event scheduler on that host and after 4 days the memory never grew anymore.
I have only tested this with 10.4.12 but we've had lots of memory issues on a host running 10.1 that has around 2.5k events which after a while gets OOM so it is likely possible that it is the same thing.

Unfortunately, MariaDB doesn't provide memory_global_by_current_bytes tables on P_S/sys so such a detailed profile isn't possible.