Build against EAP 1

For some reason EAP 2 causes a cryptic exception when compiling
 the gradle tooling extension:
 jdk.internal.util.jar.InvalidJarIndexError: Invalid index

Author: RedNesto

gradle.properties

@@ -11,7 +11,7 @@
 # suppress inspection "UnusedProperty" for whole file
 kotlin.code.style=official
 
-ideaVersion = 212-EAP-SNAPSHOT
+ideaVersion = 212.3116.43-EAP-SNAPSHOT
 ideaVersionName = 2021.2
 
 coreVersion = 1.5.11

gradle/libs.versions.toml

@@ -14,7 +14,7 @@ jflex-skeleton = "org.jetbrains.idea:jflex:1.7.0-c1fdf11"
 grammarKit = "org.jetbrains.idea:grammar-kit:1.5.1"
 
 # Gradle Tooling
-gradleToolingExtension = "com.jetbrains.intellij.gradle:gradle-tooling-extension:212-EAP-SNAPSHOT"
+gradleToolingExtension = "com.jetbrains.intellij.gradle:gradle-tooling-extension:212.3116.43-EAP-SNAPSHOT"
 annotations = "org.jetbrains:annotations:20.1.0"
 
 # Testing