RFR: 7904129: Update jtreg to bundle JUnit 5.14.2

[Christian Stein]

On Wed, 7 Jan 2026 15:54:41 GMT, Christian Stein <cstein at openjdk.org> wrote:

> Please review this change updating the JUnit version to [5.14.2](https://docs.junit.org/5.14.2/release-notes.html).

make/build-support/version-numbers line 45:

> 43: # JUnit 5 = JUnit Platform 1.y.z + JUnit Jupiter 5.y.z + JUnit Vintage 5.y.z
> 44: DEFAULT_JUNIT_VERSION=1.14.2
> 45: DEFAULT_JUNIT_JAR_CHECKSUM=99b3e0fe1df38e5eea763c168c033c030a4bd46c

Checksum copied from https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/1.14.2/junit-platform-console-standalone-1.14.2.jar.sha1

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PR Review Comment: https://git.openjdk.org/jtreg/pull/306#discussion_r2672784957