hg: jdk/submit: 8235531: Update record serialization migration tests to not use hard coded source versions

[chris.hegarty at oracle.com]

Changeset: 9a04e072302c
Author:    chegar
Date:      2019-12-10 19:10 +0000
URL:       https://hg.openjdk.java.net/jdk/submit/rev/9a04e072302c

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