idl: bump the minor datamodel version for the 9.0 release

This allows to reserve some minor versions for updates in the 8.x
release.

I've bumped it to 900 because 800 will make thing difficult if there are
more than 7 API changes in case of emergency.

Signed-off-by: Pau Ruiz Safont <pau.safont@vates.tech>

Author: psafont

ocaml/idl/datamodel_common.ml

@@ -10,7 +10,7 @@ open Datamodel_roles
               to leave a gap for potential hotfixes needing to increment the schema version.*)
 let schema_major_vsn = 5
 
-let schema_minor_vsn = 793
+let schema_minor_vsn = 900
 
 (* Historical schema versions just in case this is useful later *)
 let rio_schema_major_vsn = 5