Revert "2.3.7.BUILD-SNAPSHOT"

This reverts commit 63c2e37c8b97285ebb67089790cf6027256f54cd.
update version to 2.3.7.BUILD-SNAPSHOT
GRAILS-11104 related improvement: allow manual configuration of ChainedTransactionManager bean
- don't configure BE1PC if the transactionManager bean is already a ChainedTransactionManager
GRAILS-11104 related improvement: don't add readOnly additional dataSources to the BE1PC transaction manager
- handle them in the same way as 'transactional = false' when 'readOnly = true'