refactor(android-distribution): Import Future type for cleaner code (EME-413)

Add explicit import for java.util.concurrent.Future and use short form
instead of fully qualified name in method signature.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: runningcode

sentry-android-distribution/src/main/java/io/sentry/android/distribution/DistributionIntegration.kt

@@ -14,6 +14,7 @@ import io.sentry.UpdateInfo
 import io.sentry.UpdateStatus
 import java.net.SocketTimeoutException
 import java.net.UnknownHostException
+import java.util.concurrent.Future
 import org.jetbrains.annotations.ApiStatus
 
 /**
@@ -88,7 +89,7 @@ public class DistributionIntegration(context: Context) : Integration, IDistribut
    *
    * @return Future that will resolve to an UpdateStatus result
    */
-  public override fun checkForUpdate(): java.util.concurrent.Future<UpdateStatus> {
+  public override fun checkForUpdate(): Future<UpdateStatus> {
     return sentryOptions.executorService.submit<UpdateStatus> { checkForUpdateBlocking() }
   }