Upgrading GSON version from 2.8.5 to 2.9.0

[amamounelsayed]

For best practices please for Package com.google.gson.internal Do NOT use any class in this package as they are meant for internal use in Gson. These classes will very likely change incompatibly in future versions.

-- https://javadoc.io/doc/com.google.code.gson/gson/1.7.2/com/google/gson/internal/package-summary.html