Bump io.projectreactor:reactor-bom from 2023.0.12 to 2023.0.15 (#2975)

Bumps [io.projectreactor:reactor-bom](https://github.com/reactor/reactor) from 2023.0.12 to 2023.0.15.
- [Release notes](https://github.com/reactor/reactor/releases)
- [Commits](https://github.com/reactor/reactor/compare/2023.0.12...2023.0.15)

---
updated-dependencies:
- dependency-name: io.projectreactor:reactor-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -68,7 +68,7 @@ ext {
 	mockitoVersion = '5.6.0'
 	rabbitmqStreamVersion = '0.14.0'
 	rabbitmqVersion = '5.19.0'
-	reactorVersion = '2023.0.12'
+	reactorVersion = '2023.0.15'
 	snappyVersion = '1.1.10.7'
 	springDataVersion = '2023.1.12'
 	springRetryVersion = '2.0.10'