RFR: 8333743: Change .jcheck/conf branches property to match valid branches

[Iris Clark]

On Thu, 6 Jun 2024 17:10:16 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Update the `branches` property in `.jcheck/conf` to allow branches, now that we are using them for JDK stabilization. This will allow integrators to use Skara to create new stabilization branches (we had to do it manually this time).

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19582#pullrequestreview-2102629350