[Gradle] kgp-idea: Update testedVersion to 1.8.20-dev-2192 for compatibility tests

KT-54825

libraries/tools/kotlin-gradle-plugin-idea-for-compatibility-tests/build.gradle.kts

@@ -4,7 +4,7 @@
  * Version of kotlin-gradle-plugin-idea module that should be resolved for compatibility tests
  * This version can be treated as 'minimal guaranteed backwards compatible version' of the module.
  */
-val testedVersion = "1.7.20-dev-2127"
+val testedVersion = "1.8.20-dev-2192"
 
 val isSnapshotTest = properties.contains("kgp-idea.snapshot_test")
 val resolvedTestedVersion = if (isSnapshotTest) properties["defaultSnapshotVersion"].toString() else testedVersion
@@ -13,6 +13,7 @@ val resolvedTestedVersion = if (isSnapshotTest) properties["defaultSnapshotVersi
 
 repositories {
     maven(url = "https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap")
+    maven(url = "https://maven.pkg.jetbrains.space/kotlin/p/kotlin/kotlin-ide-plugin-dependencies")
 }
 
 if (isSnapshotTest) {
@@ -36,6 +37,12 @@ dependencies {
     incomingClasspath(kotlin("gradle-plugin-idea", resolvedTestedVersion))
     incomingClasspath(testFixtures(kotlin("gradle-plugin-idea", resolvedTestedVersion)))
     incomingClasspath(kotlin("gradle-plugin-idea-proto", resolvedTestedVersion))
+
+    incomingClasspath.resolutionStrategy {
+        force(kotlin("stdlib", bootstrapKotlinVersion))
+        force(kotlin("test-junit", bootstrapKotlinVersion))
+        force(kotlin("gradle-plugin-annotations", bootstrapKotlinVersion)) // Remove after this is available under 'testedVersion'
+    }
 }
 
 val syncClasspath by tasks.register<Sync>("syncClasspath") {