Bump reactor-core from 3.4.5 to 3.4.17

Bumps [reactor-core](https://github.com/reactor/reactor-core) from 3.4.5 to 3.4.17.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.4.5...v3.4.17)

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

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

Author: dependabot[bot]

kotlin/pom.xml

@@ -42,7 +42,7 @@
       <dependency>
           <groupId>io.projectreactor</groupId>
           <artifactId>reactor-core</artifactId>
-          <version>3.4.5</version>
+          <version>3.4.17</version>
           <scope>test</scope>
       </dependency>
   </dependencies>