git: openjdk/mobile: 8235531: Update record serialization migration tests to not use hard coded source versions

[duke]

Changeset: dadaffbb
Author:    Chris Hegarty <chegar at openjdk.org>
Date:      2019-12-10 19:10:14 +0000
URL:       https://git.openjdk.java.net/mobile/commit/dadaffbb

8235531: Update record serialization migration tests to not use hard coded source versions

Reviewed-by: darcy

! test/jdk/java/io/Serializable/records/migration/AbstractTest.java