Suppress deprecation on reactRoot passed as deprecatedReactRoot

Summary:
I'm suppressing this deprecation on `reactRoot` as it's unnecessary.
It creates noise and the usage is actually legit.

Changelog:
[Internal] [Changed] - Suppress deprecation on reactRoot passed as deprecatedReactRoot

Reviewed By: cipolleschi

Differential Revision: D40139555

fbshipit-source-id: f3755f020ab1dceb17d0fdd18c6c8e374c87c60c

packages/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactPlugin.kt

@@ -119,7 +119,7 @@ class ReactPlugin : Plugin<Project> {
             "generateCodegenArtifactsFromSchema", GenerateCodegenArtifactsTask::class.java) {
               it.dependsOn(generateCodegenSchemaTask)
               it.reactNativeDir.set(extension.reactNativeDir)
-              it.deprecatedReactRoot.set(extension.reactRoot)
+              @Suppress("DEPRECATION") it.deprecatedReactRoot.set(extension.reactRoot)
               it.nodeExecutableAndArgs.set(extension.nodeExecutableAndArgs)
               it.codegenDir.set(extension.codegenDir)
               it.generatedSrcDir.set(generatedSrcDir)