build(deps): bump reactor-core in /server/api-service

Bumps [reactor-core](https://github.com/reactor/reactor-core) from 3.4.19 to 3.5.5.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.4.19...v3.5.5)

---
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]

server/api-service/pom.xml

@@ -202,7 +202,7 @@
             <dependency>
                 <groupId>io.projectreactor</groupId>
                 <artifactId>reactor-core</artifactId>
-                <version>3.4.19</version>
+                <version>3.5.5</version>
             </dependency>
 
             <dependency>