Use Locale.ROOT for capitalization of variant names

Summary:
The IDE is complainign as we're using capitalization functions that
are not locale-independent. I'm changing this to use `Locale.ROOT`.
Once we move to Kotlin 1.5 we're going to replace those functions with newer ones.

Changelog:
[Internal] [Changed] - Use Locale.ROOT for capitalization of variant names

Reviewed By: ShikaSD

Differential Revision: D30958992

fbshipit-source-id: 225af4e7e323f143ab75bad106f3bca3db510b22

Author: cortinico

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

@@ -17,14 +17,15 @@ import com.facebook.react.utils.detectedCliPath
 import com.facebook.react.utils.detectedEntryFile
 import com.facebook.react.utils.detectedHermesCommand
 import java.io.File
+import java.util.*
 import org.gradle.api.Project
 import org.gradle.api.tasks.Copy
 
 private const val REACT_GROUP = "react"
 
 @Suppress("SpreadOperator")
 internal fun Project.configureReactTasks(variant: BaseVariant, config: ReactAppExtension) {
-  val targetName = variant.name.capitalize()
+  val targetName = variant.name.capitalize(Locale.ROOT)
   val isRelease = variant.isRelease
   val targetPath = variant.dirName
 
@@ -239,4 +240,4 @@ private fun BaseVariant.checkBundleEnabled(config: ReactAppExtension): Boolean {
 }
 
 private val BaseVariant.isRelease: Boolean
-  get() = name.toLowerCase().contains("release")
+  get() = name.toLowerCase(Locale.ROOT).contains("release")