build: bump io.micronaut.build.shared.settings from 5.2.3 to 5.3.9 (#205)

Bumps [io.micronaut.build.shared.settings](https://github.com/micronaut-projects/micronaut-build) from 5.2.3 to 5.3.9.
- [Release notes](https://github.com/micronaut-projects/micronaut-build/releases)
- [Commits](micronaut-projects/micronaut-build@v5.2.3...v5.3.9)

---
updated-dependencies:
- dependency-name: io.micronaut.build.shared.settings
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

Author: dependabot[bot]

settings.gradle

@@ -6,7 +6,7 @@ pluginManagement {
 }
 
 plugins {
-    id 'io.micronaut.build.shared.settings' version '5.2.3'
+    id 'io.micronaut.build.shared.settings' version '5.3.9'
 }
 rootProject.name = 'rxjava3-parent'