chore(build): update Gradle to 8.14.3, upgrade plugin

buildSrc/build.gradle.kts

@@ -3,12 +3,6 @@ plugins {
     `kotlin-dsl`
 }
 
-java {
-    toolchain {
-        languageVersion.set(JavaLanguageVersion.of(11))
-    }
-}
-
 repositories {
     mavenCentral()
 }