graphics/py-vecrec: update 0.3.0 -> 0.3.1

<!--next-version-placeholder-->

• Give Rect.round() the same API as round() ([169bf73](https://github.com/kxgames/vecrec/commit/169bf735bfccfbde8ea73dfa4769cae12bc6be3f))

PR: ports/280947
Reported by: Älven <alster@vinterdalen.se>