[release] 3.0.0 - ⚠️ Bump Kotlin JVM Plugin Version (#491)

### New Features
- Bump kotlin JVM plugin from 1.9 to 2.x, this should only effect people
on very old kotlin jvm versions.
  - Also bump okhttp and GSON versions.

see here: https://endoflife.date/kotlin






>Included In This Release
>- 851533a Weihao Ding
>   - chore: bump couple versions (#490)

Author: weihao-statsig

gradle.properties

@@ -8,7 +8,7 @@ signAllPublications=true
 
 GROUP=com.statsig
 POM_ARTIFACT_ID=serversdk
-VERSION_NAME=2.2.2
+VERSION_NAME=3.0.0
 
 POM_NAME=Statsig Server SDK
 POM_DESCRIPTION=A feature gating and a/b testing library for statsig

src/main/kotlin/com/statsig/sdk/StatsigMetadata.kt

@@ -4,7 +4,7 @@ import com.google.gson.annotations.SerializedName
 import java.util.Properties
 import java.util.UUID
 
-private const val VERSION = "2.2.2"
+private const val VERSION = "3.0.0"
 
 internal data class StatsigMetadata(
     @SerializedName("sdkType") var sdkType: String = "java-server",