[release] 3.1.2 - Bump GRPC package Version (#503)

### Fixes
- Known vulnerabilities in the io.grpc:grpc-netty-shaded package. Bumped
to 1.75.0





>Included In This Release
>- 0276a9e Weihao Ding
>   - fix: bump grpc version (#502)

Author: weihao-statsig

gradle.properties

@@ -8,7 +8,7 @@ signAllPublications=true
 
 GROUP=com.statsig
 POM_ARTIFACT_ID=serversdk
-VERSION_NAME=3.1.1
+VERSION_NAME=3.1.2
 
 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 = "3.1.1"
+private const val VERSION = "3.1.2"
 
 internal data class StatsigMetadata(
     @SerializedName("sdkType") var sdkType: String = "java-server",