remove unused import

Author: dillitz

sql/connect/server/src/main/scala/org/apache/spark/sql/connect/planner/SparkConnectPlanner.scala

@@ -31,7 +31,7 @@ import io.grpc.{Context, Status, StatusRuntimeException}
 import io.grpc.stub.StreamObserver
 import org.apache.commons.lang3.exception.ExceptionUtils
 
-import org.apache.spark.{Partition, SparkEnv, TaskContext}
+import org.apache.spark.{Partition, TaskContext}
 import org.apache.spark.annotation.{DeveloperApi, Since}
 import org.apache.spark.api.python.{PythonEvalType, SimplePythonFunction}
 import org.apache.spark.connect.proto