RFR: Upgrade to JUnit 4.13.2

[Henri Tremblay]

On Fri, 26 Feb 2021 11:30:58 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Upgrade to JUnit 4.13.2
>
> This looks fine. We need to wait for @robilad to get OCA checks all green.

Ok. I'm not sure if I need to do anything on my side. I have already signed the OCA but I don't think it's linked to my Github account.

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PR: https://git.openjdk.java.net/jmh/pull/24