www/gitea: upgrade 1.9.0 -> 1.9.1

• This release contains two security fixes, so we highly recommend updating.

PR: 239930
Submitted by: stb@lassitu.de (maintainer)
MFH: 2019Q3
Relnotes: https://blog.gitea.io/2019/08/gitea-1.9.1-is-released/
Security: https://github.com/go-gitea/gitea/pull/7715

		https://github.com/go-gitea/gitea/pull/7762