Bump io.projectreactor:reactor-bom from 2023.0.3 to 2023.0.4 (#9018)

Bumps [io.projectreactor:reactor-bom](https://github.com/reactor/reactor) from 2023.0.3 to 2023.0.4.
- [Release notes](https://github.com/reactor/reactor/releases)
- [Commits](https://github.com/reactor/reactor/compare/2023.0.3...2023.0.4)

---
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

@@ -101,7 +101,7 @@ ext {
     postgresVersion = '42.6.2'
     protobufVersion = '3.25.3'
     r2dbch2Version = '1.0.0.RELEASE'
-    reactorVersion = '2023.0.3'
+    reactorVersion = '2023.0.4'
     resilience4jVersion = '2.1.0'
     romeToolsVersion = '2.1.0'
     rsocketVersion = '1.1.4'