Bump kotlin-gradle-plugin from 1.3.70 to 1.3.71

Bumps [kotlin-gradle-plugin](https://github.com/JetBrains/kotlin) from 1.3.70 to 1.3.71.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.3.71/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.3.70...v1.3.71)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

build.gradle

@@ -21,7 +21,7 @@ import org.springframework.boot.gradle.plugin.SpringBootPlugin
 
 buildscript {
     ext {
-        kotlin_version = '1.3.70'
+        kotlin_version = '1.3.71'
         spring_boot_version = '2.2.5.RELEASE'
     }