Gson version should be consistent
Gson version should be consistent

The version here is hardcoded and does not correspond to the version defined in the global `gradle.properties` [here](https://github.com/ktorio/ktor/blob/99aaf42a9210dbf25c500a980490d94ba3667435/gradle.properties#L38).
I suggest the feature should use the global version of gson, the same way [another client feature](https://github.com/ktorio/ktor/blob/99aaf42a9210dbf25c500a980490d94ba3667435/ktor-client/ktor-client-features/ktor-client-json/ktor-client-gson/build.gradle#L4) does.
Also, in the current state dependency resolution strategy `failOnVersionConflict` actually fails if the two features are used together.
ktorio/ktor,ktorio/ktor,ktorio/ktor,ktorio/ktor