other(localnet): Update sapphire localnet gateway to 5.2.0

Author: ptrus

docker/sapphire-localnet/Dockerfile

@@ -16,7 +16,7 @@ ARG OASIS_CORE_VERSION=25.3
 #ARG OASIS_CORE_BRANCH=stable/24.3.x
 ARG OASIS_CLI_VERSION=0.13.4
 #ARG OASIS_CLI_BRANCH=master
-ARG OASIS_WEB3_GATEWAY_BRANCH=v5.2.0-rc1
+ARG OASIS_WEB3_GATEWAY_BRANCH=v5.2.0
 #ARG OASIS_WEB3_GATEWAY_VERSION=main
 #ARG OASIS_SAPPHIRE_PARATIME_BRANCH=main