[release] 1.13.1 - Multi instances, network requests improvements (#237)

Improvements:
- Make `options`(e.g. `CheckGateOptions`) parameters in Sync version of
core apis optional for multiple StatsigServer instances.
- Log details if the network request failed.






>Included In This Release
>- 0516548 weihao-statsig
>   - Make`options` parameter optional for multi-instance (#236)
>- 850b33b weihao-statsig
>   - Log more if network request failed (#233)

Author: weihao-statsig

gradle.properties

@@ -6,7 +6,7 @@ RELEASE_SIGNING_ENABLED=true
 
 GROUP=com.statsig.serversdk
 POM_ARTIFACT_ID=serversdk
-VERSION_NAME=1.13.0
+VERSION_NAME=1.13.1
 
 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

@@ -6,7 +6,7 @@ import com.google.gson.annotations.SerializedName
 import java.util.Properties
 import java.util.UUID
 
-private const val VERSION = "1.13.0"
+private const val VERSION = "1.13.1"
 
 internal data class StatsigMetadata(@SerializedName("sdkType") var sdkType: String = "java-server", @SerializedName("sessionID") var sessionID: String = UUID.randomUUID().toString(), @SerializedName("languageVersion") var languageVersion: String = System.getProperty("java.version"), @SerializedName("exposureLoggingDisabled") var exposureLoggingDisabled: Boolean? = null) {
     @SerializedName("sdkVersion")