[3.21] Bump to 0.21.6

GitOrigin-RevId: fa2880aae6cb0e07ee9d6922edac7118ab43cc39

Author: kiryldz

gradle/dependencies.gradle

@@ -12,7 +12,7 @@ ext {
   // Release Train depends on these two lines below
   // https://github.com/mapbox/release-train/blob/bd530da200d62fb45166ef91d7d892d90a453fa6/backend/model/step/navcoreandroid/PrepareChangelogNavCore.py#L122-L124
 
-  def mapboxSdkVersionSuffix = '21.5-SNAPSHOT-05-22--12-39.git-3546a94'
+  def mapboxSdkVersionSuffix = '21.6'
   def mapboxNavigatorVersion = "324.${mapboxSdkVersionSuffix}"
 
   def ndkVersionSuffix = ""