Bump kotlin.version from 1.4.30 to 1.4.31

Bumps `kotlin.version` from 1.4.30 to 1.4.31.

Updates `kotlin-stdlib` from 1.4.30 to 1.4.31
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.4.31/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.4.30...v1.4.31)

Updates `kotlin-maven-plugin` from 1.4.30 to 1.4.31

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

Author: dependabot[bot]

pom.xml

@@ -28,7 +28,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <java.version>8</java.version>
-    <kotlin.version>1.4.30</kotlin.version>
+    <kotlin.version>1.4.31</kotlin.version>
     <spotless.version>2.8.1</spotless.version>
     <retrofit.version>2.9.0</retrofit.version>
     <auto.version>1.7.1</auto.version>