Upgrade slf4j and kotlin platform

Signed-off-by: Piyush Mor <[email protected]>

Author: Piyush Mor

build.gradle.kts

@@ -1,7 +1,7 @@
 import java.util.*
 
 plugins {
-    kotlin("multiplatform") version "1.3.41"
+    kotlin("multiplatform") version "1.3.50"
     id("com.jfrog.bintray") version "1.8.4"
     `maven-publish`
     `java-library` //todo: ask whether we need javadoc at all as it is always empty

versions.gradle.kts

@@ -1,4 +1,4 @@
-extra["sl4j_version"] = "1.7.25"
+extra["sl4j_version"] = "1.7.29"
 extra["log4j_version"] = "2.11.1"
 extra["mockito_version"] = "1.10.19"
 extra["junit_version"] = "4.12"