H2: Adapt to sequence and column types changes in 1.4.201

Description

In context of trying to update h2 in `hibernate-orm` from 1.4.196 to 1.4.200+, the following required changes to H2Dialect were identified in 1.4.201 (not yet released as of May 17th 2020):

Environment

None

Assignee

Unassigned

Reporter

Falko Modler

Fix versions

None

Labels

None

backPortable

Backport?

Suitable for new contributors

None

Requires Release Note

None

Pull Request

None

backportDecision

None

Components

Affects versions

Priority

Major
Configure