Update driver-core/src/test/unit/com/mongodb/internal/connection/DefaultServerSpecification.groovy

Co-authored-by: Ross Lawley <ross.lawley@gmail.com>

Author: vbabanin

driver-core/src/test/unit/com/mongodb/internal/connection/DefaultServerSpecification.groovy

@@ -210,7 +210,6 @@ class DefaultServerSpecification extends Specification {
         given:
         def connectionPool = Mock(ConnectionPool)
         def serverMonitor = Mock(ServerMonitor)
-        connectionPool.get(createOperationContext()) >> { throw exceptionToThrow }
 
         def server = defaultServer(connectionPool, serverMonitor)
         server.close()