bump nav sdk for android auto

Author: Zayankovsky

libnavui-androidauto/build.gradle

@@ -41,7 +41,7 @@ dependencies {
     // This defines the minimum version of Maps, Navigation, and Search which are included in
     // this SDK. To upgrade the SDK versions, you can specify a newer version in your downstream
     // build.gradle.
-    def carNavVersion = "2.6.0-alpha.2"
+    def carNavVersion = "2.6.0-rc.1"
     def carSearchVersion = "1.0.0-beta.29"
     api("com.mapbox.navigation:android:${carNavVersion}")
     api("com.mapbox.search:mapbox-search-android:${carSearchVersion}")