RFR: 8274274: Update JUnit to version 5.8.1 [v5]

[John Hendrikx]

On Thu, 11 Nov 2021 15:11:32 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> John Hendrikx has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Readd junit declaration in allprojects and set junit version to 4.13.2
>
> build.gradle line 1953:
> 
>> 1951:         testRuntimeOnly(group: "org.junit.vintage", name: "junit-vintage-engine", version: "5.8.1") {
>> 1952:             exclude(group: "org.apiguardian", module: "apiguardian-api")
>> 1953:         }
> 
> As it turns out, `apiguardian` no longer needs to be blocked, so you can restore it if it is easier.

Okay, I'll remove the exclusion on apiguardian then as it would just be confusing why it was excluded in the first place.  Hamcrest was already included as JUnit 5 wouldn't work without it.

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PR: https://git.openjdk.java.net/jfx/pull/633