Allow builds with more recent JDKs again

build.gradle.kts

@@ -1,6 +1,7 @@
 import org.jetbrains.changelog.Changelog
 import org.jetbrains.changelog.markdownToHTML
 import org.jetbrains.intellij.tasks.RunPluginVerifierTask.FailureLevel
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import java.util.EnumSet
 
 plugins {
@@ -27,9 +28,16 @@ group = pluginGroup
 version = pluginVersion
 
 java {
-    toolchain {
-        // Set JVM version targeted by Java and Kotlin
-        languageVersion = JavaLanguageVersion.of(17)
+    // Don't use Gradle's toolchain feature as it prevents building the project with more recent JDKs. Related issues:
+    // https://github.com/gradle/gradle/issues/16256 - Ability to set a min language version for a toolchain
+    // https://github.com/gradle/gradle/issues/17444 - Toolchains feature does not appear to treat Java as backwards compatible
+    // https://github.com/gradle/gradle/issues/18894 - More flexibility in querying Java toolchains
+    sourceCompatibility = JavaVersion.VERSION_17
+}
+
+kotlin {
+    compilerOptions {
+        jvmTarget.set(JvmTarget.JVM_17)
     }
 }