fix(deps): update dependency io.reactivex.rxjava3:rxjava to v3.1.8 (#348

)

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

gradle/libs.versions.toml

@@ -12,7 +12,7 @@ micronaut-validation = "4.0.3"
 micronaut-platform = "4.0.3"
 
 rxjava2 = "2.2.21"
-rxjava3 = "3.1.6"
+rxjava3 = "3.1.8"
 
 managed-reactor-bom = "2022.0.9"
 managed-micrometer-context-propagation = "1.0.6"