[K/N][build] Add coroutines dependency for bootstrap test

Bootstrap test builds compileKotlin that fails to resolve
coroutines.

kotlin-native/build-tools/build.gradle.kts

diff --git a/kotlin-native/build-tools/build.gradle.kts b/kotlin-native/build-tools/build.gradle.kts
index edfb036..d5ac3c1 100644
--- a/kotlin-native/build-tools/build.gradle.kts
+++ b/kotlin-native/build-tools/build.gradle.kts
@@ -64,6 +64,8 @@
         }
     }
 
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.0")
+
     api(project(":native:kotlin-native-utils"))
     api(project(":kotlin-native-shared"))
     api(project(":kotlinx-metadata-klib"))