Update sample workflow_version to 1.7.1

Author: rjrjr

samples/tutorial/build.gradle

@@ -4,7 +4,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 buildscript {
   ext {
     kotlin_version = "1.6.10"
-    workflow_version = "1.7.0"
+    workflow_version = "1.7.1"
 
     deps = [
         activityktx: 'androidx.activity:activity-ktx:1.3.0',