Bump io.projectreactor:reactor-core from 3.7.3 to 3.8.4

Bumps [io.projectreactor:reactor-core](https://github.com/reactor/reactor-core) from 3.7.3 to 3.8.4.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.7.3...v3.8.4)

---
updated-dependencies:
- dependency-name: io.projectreactor:reactor-core
  dependency-version: 3.8.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -247,7 +247,7 @@
 		<dependency>
 			<groupId>io.projectreactor</groupId>
 			<artifactId>reactor-core</artifactId>
-			<version>3.7.3</version>
+			<version>3.8.4</version>
 		</dependency>
 
 		<!-- Testing -->