Bump kotlinVersion from 1.3.31 to 1.3.40

Bumps `kotlinVersion` from 1.3.31 to 1.3.40.

Updates `kotlin-gradle-plugin` from 1.3.31 to 1.3.40
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.3.40/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.3.31...v1.3.40)

Updates `kotlin-stdlib-jdk7` from 1.3.31 to 1.3.40
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.3.40/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.3.31...v1.3.40)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build.gradle

@@ -17,7 +17,7 @@ buildscript {
 
         gson = '2.8.5'
 
-        kotlinVersion = '1.3.31'
+        kotlinVersion = '1.3.40'
     }
     repositories {
         google()