[ann] Agrest 4.2 / 4.3

[Andrus Adamchik]

Agrest 4.2 was released on November 16, and before I had a chance to announce it, Agrest 4.3 was also released :) Both include a number of bug fixes addressing a few annoying issue in OpenAPI support and Json type redering. Bootique 2.0.B1 snapshot is already on 4.3.

Release notes:

## Release 4.3

* #473 Cayenne backend - prefetches do not work if id is excluded from parent AgEntity
* #474 Error encoding Json attributes if entity has more than one attribute

## Release 4.2

* #468 ClassCastException in combination Agrest 3.4 and Cayenne 4.1.
* #469 AgEntityModelConverter to use predictable alphabetic ordering
* #470 Swagger model must include entities reachable from resource entities
* #472 remove legacy "agrest" module

Andrus