Bump io.projectreactor:reactor-core from 3.5.11 to 3.6.4

Bumps [io.projectreactor:reactor-core](https://github.com/reactor/reactor-core) from 3.5.11 to 3.6.4.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.5.11...v3.6.4)

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

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -20,7 +20,7 @@ gradle-kotlin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.
 gradle-ktlint = { module = "org.jlleitschuh.gradle:ktlint-gradle", version = "12.1.0" }
 gradle-nexusPublish = { module = "io.github.gradle-nexus:publish-plugin", version = "1.3.0" }
 # dependencies
-reactor-core = { module = "io.projectreactor:reactor-core", version = "3.6.3" }
+reactor-core = { module = "io.projectreactor:reactor-core", version = "3.6.4" }
 rxjava = { module = "io.reactivex.rxjava3:rxjava", version = "3.1.8" }
 mongodb-core = { module = "org.mongodb:mongodb-driver-core", version.ref = "mongodb" }
 mongodb-reactivestreams = { module = "org.mongodb:mongodb-driver-reactivestreams", version.ref = "mongodb" }