Merge pull request #15930 from rabbitmq/mk-correct-4.3.0-release-notes

`4.3.0` release notes: finish a sentence

Merge pull request #15926 from rabbitmq/mk-test-flakes-v4.3.x-apr-1-2026-round-3

More robust state threading in more `rabbitmq_stream` suites

`rabbitmq_stream`: test flake fixes

Merge pull request #15923 from rabbitmq/mk-test-flake-fixes-apr-1-2026-round-2

Test flake chase: make sure proxies have `kernel.prevent_overlapping_partitions` set to `false`

Merge pull request #15916 from rabbitmq/mk-test-flake-fixes-apr-1-2026

Rework a few more tests to not depend on entity counts

Merge pull request #15919 from rabbitmq/dependabot/npm_and_yarn/selenium/main/proxy-4.0.0

Merge pull request #15917 from rabbitmq/dependabot/npm_and_yarn/selenium/main/minor-patch-updates-6035dfc59a

Bump proxy from 3.0.0 to 4.0.0 in /selenium

Bump amqplib in /selenium in the minor-patch-updates group

`quorum_queue_SUITE`: do not assume that there are exactly 2 channels

Merge pull request #15901 from rabbitmq/rabbitmq-server-15819