fix(deps): update dependency io.micronaut.rxjava3:micronaut-rxjava3-bom to v3.4.0 (#1590)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -24,7 +24,7 @@ micronaut-jaxrs = "4.5.0"
 micronaut-security = "4.9.0"
 micronaut-serde = "2.10.2"
 micronaut-rxjava2 = "2.3.0"
-micronaut-rxjava3 = "3.3.0"
+micronaut-rxjava3 = "3.4.0"
 micronaut-reactor = "3.4.0"
 micronaut-gradle-plugin = "4.4.0"
 micronaut-groovy = "4.3.0"