Bump projectreactor.version from 3.4.4 to 3.4.6

Bumps `projectreactor.version` from 3.4.4 to 3.4.6.

Updates `reactor-core` from 3.4.4 to 3.4.6
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.4.4...v3.4.6)

Updates `reactor-test` from 3.4.4 to 3.4.6
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.4.4...v3.4.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -49,7 +49,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <axon.version>4.5.2</axon.version>
-        <projectreactor.version>3.4.4</projectreactor.version>
+        <projectreactor.version>3.4.6</projectreactor.version>
 
         <spring.version>5.3.8</spring.version>
         <spring.boot.version>2.5.1</spring.boot.version>