Bump io.projectreactor:reactor-core from 3.6.1 to 3.6.4

Bumps [io.projectreactor:reactor-core](https://github.com/reactor/reactor-core) from 3.6.1 to 3.6.4.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.6.1...v3.6.4)

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

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

Author: dependabot[bot]

build.gradle

@@ -25,7 +25,7 @@ dependencies {
 
     implementation('com.fasterxml.jackson.core:jackson-databind:2.16.2')
     implementation("io.reactivex.rxjava3:rxjava:3.1.8")
-    implementation('io.projectreactor:reactor-core:3.6.1')
+    implementation('io.projectreactor:reactor-core:3.6.4')
     implementation("org.threeten:threeten-extra:1.7.2")
     implementation("org.slf4j:slf4j-api:2.0.12")
     implementation("ch.qos.logback:logback-classic:1.5.3")