Bump reactor-core from 3.4.24 to 3.5.3

Bumps [reactor-core](https://github.com/reactor/reactor-core) from 3.4.24 to 3.5.3.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.4.24...v3.5.3)

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

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

Author: dependabot[bot]

pom.xml

@@ -81,7 +81,7 @@
         <reactive-streams.version>1.0.4</reactive-streams.version>
         <rxjava2.version>2.2.21</rxjava2.version>
         <rxjava3.version>3.1.5</rxjava3.version>
-        <reactor-core.version>3.4.24</reactor-core.version>
+        <reactor-core.version>3.5.3</reactor-core.version>
 
         <microprofile-reactive-streams.version>2.0</microprofile-reactive-streams.version>
         <microprofile-context-propagation.version>1.3</microprofile-context-propagation.version>