GH-1015 Update Kotlin libraries

Resolves #1015

Author: olegz

spring-cloud-function-kotlin/pom.xml

@@ -64,15 +64,15 @@
 			<plugin>
 				<artifactId>kotlin-maven-plugin</artifactId>
 				<groupId>org.jetbrains.kotlin</groupId>
-				<version>1.6.0</version>
+				<version>1.8.10</version>
 				<configuration>
 					<args>
 						<arg>-Xjsr305=strict</arg>
 					</args>
 					<compilerPlugins>
 						<plugin>spring</plugin>
 					</compilerPlugins>
-					<jvmTarget>1.8</jvmTarget>
+					<jvmTarget>17</jvmTarget>
 				</configuration>
 				<executions>
 					<execution>
@@ -85,15 +85,15 @@
 								<sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
 								<sourceDir>${project.basedir}/src/test/java</sourceDir>
 							</sourceDirs>
-							<jvmTarget>1.8</jvmTarget>
+							<jvmTarget>17</jvmTarget>
 						</configuration>
 					</execution>
 				</executions>
 				<dependencies>
 					<dependency>
 						<groupId>org.jetbrains.kotlin</groupId>
 						<artifactId>kotlin-maven-allopen</artifactId>
-						<version>1.6.0</version>
+						<version>1.8.10</version>
 					</dependency>
 				</dependencies>
 			</plugin>

spring-cloud-function-samples/function-sample-kotlin-web/pom.xml

@@ -84,7 +84,7 @@
 					<dependency>
 						<groupId>org.jetbrains.kotlin</groupId>
 						<artifactId>kotlin-maven-allopen</artifactId>
-						<version>1.4.21</version>
+						<version>1.8.10</version>
 					</dependency>
 				</dependencies>
 			</plugin>