Kotlin: Update build.gradle to include the 1.7.0 RC

Author: igfoo

java/kotlin-extractor/build.gradle

@@ -35,6 +35,7 @@ sourceSets {
                     "utils/versions/v_1_5_21/*.kt",
                     "utils/versions/v_1_5_31/*.kt",
                     "utils/versions/v_1_6_10/*.kt",
+                    "utils/versions/v_1_7_0-RC/*.kt",
                     // "utils/versions/v_1_6_20/*.kt",
             ]
         }