Use Safe-Merge Coordinator from Black Hole playground

.space/safe-merge-coordinator.json

diff --git a/.space/safe-merge-coordinator.json b/.space/safe-merge-coordinator.json
index 3894147..305ce6d 100644
--- a/.space/safe-merge-coordinator.json
+++ b/.space/safe-merge-coordinator.json
@@ -3,7 +3,7 @@
   "builds": [
     {
       "teamcity": {
-        "configuration": "Kotlin_KotlinDev_SafeMergeCoordinator",
+        "configuration": "Kotlin_BuildPlayground_BlackHole_SafeMergeCoordinator",
         "url": "https://buildserver.labs.intellij.net",
         "token": "${space-safe-merge-kt}",
         "ssl-keystore": "BuildServer client"