[release/7.0] Correct minimum memory size value from 200MB to 20MB

[github-actions]

Backport of #77682 to release/7.0

/cc @akoeplinger@nealef

Customer Impact

Typo caused value to be 200MB instead of 20MB which caused an incorrect calculation of the cgroup minimum memory size. This prevented mono on s390x from observing memory limits when running inside containers.

Testing

CI testing.

Risk

Low.

IMPORTANT: Is this backport for a servicing release? If so and this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.

[carlossanlop]

@akoeplinger@vargaz this needs to go through Tactics. Can one of you please fill out the template and send the email to request approval?

[carlossanlop]

And when ready, please add the servicing-consider label.

[carlossanlop]

The re-run came mostly green. The only CI failure seems to be an unrelated nuget download problem with the following error, which I reported to FR, and I was told this is another instance of dotnet/arcade#10885 :

Response status code does not indicate success: 500 (Internal Server Error - Request was blocked due to exceeding usage of resource 'Concurrency' in namespace 'IPAddress'. For more information on why your request was blocked, see the topic "Rate limits" on the Microsoft Web site (https://go.microsoft.com/fwlink/?LinkId=823950). (DevOps Activity ID: F690A076-90B8-4339-B8EA-8E574E74539B)).

Aside from that: Signed off by area owner, approved by Tactics, no need for OOB package authoring changes. Ready to merge.