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

[Kevin Rushforth]

On Thu, 6 Jun 2024 18:24:50 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Clean backport of `.jcheck/conf` change to jdk23.

Test comment to check that Skara now prefixes the RFR email with the target branch (if not master).

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PR Comment: https://git.openjdk.org/jdk/pull/19584#issuecomment-2153274469