RFR: build: update to JUnit 5.8.2

[Erik Joelsson]

On Tue, 14 Dec 2021 08:24:03 GMT, Christian Stein <cstein at openjdk.org> wrote:

> This patch that updates JUnit Jupiter to 5.8.2 and JUnit Platform to 1.8.2.
> 
> PS: The text at https://github.com/openjdk/skara#testing reading "_JUnit 5.6.2 or later is required to run the unit tests._" seems to be out of date. Shouldn't it read like: "A recent version of JUnit 5 is..."?

I'm not sure why an explicit junit version is listed in the README as the gradle build specifies the dependency anyway, but as long as that number is there, I think it should be updated in unison with the gradle dependency. It seems someone missed that last time this version was bumped. Could you add this to your change?

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PR: https://git.openjdk.java.net/skara/pull/1260