Upgrade to Kotlin 1.5.0

Closes gh-26553

buildSrc/build.gradle

@@ -20,8 +20,8 @@ dependencies {
 	implementation("org.apache.maven:maven-embedder:3.6.2")
 	implementation("org.asciidoctor:asciidoctor-gradle-jvm:3.3.2")
 	implementation("org.gradle:test-retry-gradle-plugin:1.1.9")
-	implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.0-RC")
-	implementation("org.jetbrains.kotlin:kotlin-compiler-embeddable:1.5.0-RC")
+	implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.0")
+	implementation("org.jetbrains.kotlin:kotlin-compiler-embeddable:1.5.0")
 	implementation("org.springframework:spring-core:5.2.2.RELEASE")
 	implementation("org.springframework:spring-web:5.2.2.RELEASE")
 	implementation("io.spring.javaformat:spring-javaformat-gradle-plugin:${javaFormatVersion}")

gradle.properties

@@ -4,7 +4,7 @@ org.gradle.caching=true
 org.gradle.parallel=true
 org.gradle.jvmargs=-Xmx2g -Dfile.encoding=UTF-8
 
-kotlinVersion=1.5.0-RC
+kotlinVersion=1.5.0
 tomcatVersion=9.0.45
 
 kotlin.stdlib.default.dependency=false