Bump reactor-core from 3.4.21 to 3.5.1 (#499)

Bumps [reactor-core](https://github.com/reactor/reactor-core) from 3.4.21 to 3.5.1.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.4.21...v3.5.1)

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

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

Author: dependabot[bot]

examples/restful-ws-microprofile-liberty/pom.xml

@@ -50,7 +50,7 @@
         <dependency>
             <groupId>io.projectreactor</groupId>
             <artifactId>reactor-core</artifactId>
-            <version>3.4.21</version>
+            <version>3.5.1</version>
         </dependency>
     </dependencies>