fix(deps): update dependency io.reactivex.rxjava3:rxjava to v3.1.12 (#449)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-managed-rxjava3 = "3.1.10"
+managed-rxjava3 = "3.1.12"
 
 micronaut-rxjava2 = "2.8.0"
 micronaut-docs = "3.0.0"