Bump language version for Gradle plugins' dependencies to 1.5

#KT-58569 Fixed

libraries/tools/kotlin-project-model/build.gradle.kts

@@ -24,13 +24,7 @@ projectTest(jUnitMode = JUnitMode.JUnit5) {
     useJUnitPlatform()
 }
 
-tasks.withType<KotlinJvmCompile>().configureEach {
-    kotlinOptions {
-        languageVersion = "1.4"
-        apiVersion = "1.4"
-        freeCompilerArgs += listOf("-Xskip-prerelease-check", "-Xsuppress-version-warnings")
-    }
-}
+configureKotlinCompileTasksGradleCompatibility()
 
 tasks.named<KotlinJvmCompile>("compileTestFixturesKotlin") {
     kotlinOptions {

libraries/tools/kotlin-tooling-core/build.gradle.kts

@@ -9,11 +9,6 @@ sourcesJar()
 javadocJar()
 configureKotlinCompileTasksGradleCompatibility()
 
-kotlin.sourceSets.configureEach {
-    languageSettings.apiVersion = "1.4"
-    languageSettings.languageVersion = "1.4"
-}
-
 dependencies {
     api(platform(project(":kotlin-gradle-plugins-bom")))
     compileOnly(kotlinStdlib())