Bump org.jetbrains.kotlin.jvm from 1.6.10 to 1.6.20

Bumps org.jetbrains.kotlin.jvm from 1.6.10 to 1.6.20.

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'org.jetbrains.kotlin.jvm' version '1.6.10'
+    id 'org.jetbrains.kotlin.jvm' version '1.6.20'
     id 'com.github.johnrengelman.shadow' version '7.1.1'
     id 'maven-publish'
 }
@@ -33,7 +33,7 @@ repositories {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib"
-    implementation 'com.google.code.gson:gson:2.9.0'
+    implementation 'com.google.code.gson:gson:2.8.9'
     implementation 'org.apache.logging.log4j:log4j-api:2.16.0'
     implementation 'org.apache.logging.log4j:log4j-core:2.16.0'