chore: bump snapshot version to 1.5.6-SNAPSHOT

Author: aws-sdk-kotlin-ci

gradle.properties

@@ -13,10 +13,10 @@ kotlinx.atomicfu.enableNativeIrTransformation=false
 org.gradle.jvmargs=-Xmx2G -XX:MaxMetaspaceSize=1G
 
 # SDK
-sdkVersion=1.5.5
+sdkVersion=1.5.6-SNAPSHOT
 
 # codegen
-codegenVersion=0.35.5
+codegenVersion=0.35.6-SNAPSHOT
 
 # FIXME Remove after Dokka 2.0 Gradle plugin is stable
 org.jetbrains.dokka.experimental.gradle.pluginMode=V2Enabled