Upgrade to Kotlin 1.6.10

Closes gh-27413

build.gradle

@@ -3,8 +3,8 @@ plugins {
 	id 'io.spring.nohttp' version '0.0.10'
 	id "io.freefair.aspectj" version '6.3.0' apply false
 	id 'org.jetbrains.dokka' version '1.5.0' apply false
-	id 'org.jetbrains.kotlin.jvm' version '1.5.31' apply false
-	id "org.jetbrains.kotlin.plugin.serialization" version "1.5.31" apply false
+	id 'org.jetbrains.kotlin.jvm' version '1.6.10' apply false
+	id "org.jetbrains.kotlin.plugin.serialization" version '1.6.10' apply false
 	id 'org.asciidoctor.jvm.convert' version '3.3.2'
 	id 'org.asciidoctor.jvm.pdf' version '3.3.2'
 	id "org.unbroken-dome.xjc" version '2.0.0' apply false
@@ -33,7 +33,7 @@ configure(allprojects) { project ->
 			mavenBom "io.r2dbc:r2dbc-bom:Arabba-SR10"
 			mavenBom "io.rsocket:rsocket-bom:1.1.1"
 			mavenBom "org.eclipse.jetty:jetty-bom:11.0.7"
-			mavenBom "org.jetbrains.kotlin:kotlin-bom:1.5.31"
+			mavenBom "org.jetbrains.kotlin:kotlin-bom:1.6.10"
 			mavenBom "org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.5.2"
 			mavenBom "org.jetbrains.kotlinx:kotlinx-serialization-bom:1.2.2"
 			mavenBom "org.junit:junit-bom:5.8.2"
@@ -277,8 +277,8 @@ configure([rootProject] + javaProjects) { project ->
 
 		compileKotlin {
 			kotlinOptions {
-				languageVersion = "1.3"
-				apiVersion = "1.3"
+				languageVersion = "1.6"
+				apiVersion = "1.6"
 				freeCompilerArgs = ["-Xjsr305=strict", "-Xsuppress-version-warnings", "-Xopt-in=kotlin.RequiresOptIn"]
 				allWarningsAsErrors = true
 			}

spring-context/src/main/kotlin/org/springframework/context/support/BeanDefinitionDsl.kt

@@ -178,7 +178,7 @@ open class BeanDefinitionDsl internal constructor (private val init: BeanDefinit
 									  role: Role? = null) {
 
 		val customizer = BeanDefinitionCustomizer { bd ->
-			scope?.let { bd.scope = scope.name.toLowerCase() }
+			scope?.let { bd.scope = scope.name.lowercase() }
 			isLazyInit?.let { bd.isLazyInit = isLazyInit }
 			isPrimary?.let { bd.isPrimary = isPrimary }
 			isAutowireCandidate?.let { bd.isAutowireCandidate = isAutowireCandidate }
@@ -221,7 +221,7 @@ open class BeanDefinitionDsl internal constructor (private val init: BeanDefinit
 									  crossinline function: BeanSupplierContext.() -> T) {
 
 		val customizer = BeanDefinitionCustomizer { bd ->
-			scope?.let { bd.scope = scope.name.toLowerCase() }
+			scope?.let { bd.scope = scope.name.lowercase() }
 			isLazyInit?.let { bd.isLazyInit = isLazyInit }
 			isPrimary?.let { bd.isPrimary = isPrimary }
 			isAutowireCandidate?.let { bd.isAutowireCandidate = isAutowireCandidate }