Commit ed4e2289cd introduced support for H2 2.0.x but did not upgrade
the H2 dependency.
This commit upgrades the H2 dependency to version 2.0.206 but also
adds an explicit test dependency on version 1.4.200 in spring-r2dbc,
since r2dbc-h2 does not yet support H2 2.0.x.
Once https://github.com/r2dbc/r2dbc-h2/pull/204 has been included in a
released version of r2dbc-h2 we will be able to upgrade spring-r2dbc's
test dependency on the H2 database to 2.0.x as well.
See gh-27870
See gh-27902