Bump kotlin.version from 1.5.30 to 1.6.0 (#330)

Bumps `kotlin.version` from 1.5.30 to 1.6.0.

Updates `kotlin-compiler` from 1.5.30 to 1.6.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Updates `kotlin-maven-allopen` from 1.5.30 to 1.6.0

Updates `kotlin-maven-plugin` from 1.5.30 to 1.6.0

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-compiler
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin:kotlin-maven-allopen
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin:kotlin-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

consumer_kotlin_ftw/pom.xml

@@ -23,7 +23,7 @@
 		<java.version>11</java.version>
 		<spring-cloud.version>2021.0.0-SNAPSHOT</spring-cloud.version>
 		<!-- Aligned with Gradle -->
-		<kotlin.version>1.5.30</kotlin.version>
+		<kotlin.version>1.6.0</kotlin.version>
 	</properties>
 
 	<dependencies>

consumer_with_secured_webflux/pom.xml

@@ -16,7 +16,7 @@
 
 	<properties>
 		<java.version>11</java.version>
-		<kotlin.version>1.5.21</kotlin.version>
+		<kotlin.version>1.6.0</kotlin.version>
 		<spring-cloud.version>2021.0.0-SNAPSHOT</spring-cloud.version>
 	</properties>
 

producer_kotlin/pom.xml

@@ -85,7 +85,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<java.version>11</java.version>
-		<kotlin.version>1.5.30</kotlin.version>
+		<kotlin.version>1.6.0</kotlin.version>
 		<spring-cloud.version>2021.0.0-SNAPSHOT</spring-cloud.version>
 		<spring-cloud-contract.version>3.1.1-SNAPSHOT</spring-cloud-contract.version>
 	</properties>

producer_kotlin_ftw/pom.xml

@@ -24,7 +24,7 @@
 		<spring-cloud-contract.version>3.1.1-SNAPSHOT</spring-cloud-contract.version>
 		<spring-cloud.version>2021.0.0-SNAPSHOT</spring-cloud.version>
 		<!-- Needs to align the version to what's there in Contract -->
-		<kotlin.version>1.5.30</kotlin.version>
+		<kotlin.version>1.6.0</kotlin.version>
 	</properties>
 
 	<dependencies>

producer_webflux_security/pom.xml

@@ -16,7 +16,7 @@
 
 	<properties>
 		<java.version>11</java.version>
-		<kotlin.version>1.5.30</kotlin.version>
+		<kotlin.version>1.6.0</kotlin.version>
 		<spring-cloud.version>2021.0.0-SNAPSHOT</spring-cloud.version>
 		<spring-cloud-contract.version>3.1.1-SNAPSHOT</spring-cloud-contract.version>
 		<spring-web-test-client.version>4.4.0</spring-web-test-client.version>