This PR finalizes JEP 473 by modifying the PreviewFeature JEP number and status for Stream Gatherers.
------------- Commit messages: - Updating PreviewFeature.STREAM_GATHERERS to 473 - Second Preview Changes: https://git.openjdk.org/jdk/pull/19003/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19003&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8331346 Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/19003.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19003/head:pull/19003 PR: https://git.openjdk.org/jdk/pull/19003
