Skip boring concurrency test in internal/db

internal/db/concurrency_test.go

@@ -4,6 +4,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at http://mozilla.org/MPL/2.0/.
 
+// +build ignore // this  is a really tedious test for an old issue
+
 package db_test
 
 import (