Bump versions to 3.21.7 (#14543)

* Bump versions to 3.21.7

GitOrigin-RevId: 179cbddd097e198e38ffda9686d1536bc257767a

Author: DzmitryFomchyn

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 = '21.6'
+  def mapboxSdkVersionSuffix = '21.7'
   def mapboxNavigatorVersion = "324.${mapboxSdkVersionSuffix}"
 
   def ndkVersionSuffix = ""