Update dependency org.jetbrains.kotlinx:kotlinx-serialization-json to v1.6.1

Author: renovate[bot]

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ kotlin = "1.9.0"
 mongo = "4.10.0"
 shadow = "8.1.1"
 webhooks = "0.8.4"
-json = "1.5.1"
+json = "1.6.1"
 
 slf4j = "2.0.7"
 logback = "1.4.9"