[jdk23] RFR: 8333743: Change .jcheck/conf branches property to match valid branches

[Erik Joelsson]

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

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

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19584#pullrequestreview-2103122924