Release v1.9.2 · go-gitea/gitea

BUGFIXES
- Fix wrong sender when send slack webhook (#7918) (#7924)
- Upload support text/plain; charset=utf8 (#7899)
- Lfs/lock: round locked_at timestamp to second (#7872) (#7875)
- Fix non existent milestone with 500 error (#7867) (#7873)
SECURITY
- Fix No PGP signature on 1.9.1 tag (#7874)
- Release built with go 1.12.9 to fix security fixes in golang std lib, ref: https://groups.google.com/forum/#!msg/golang-announce/oeMaeUnkvVE/a49yvTLqAAAJ
ENHANCEMENT
- Fix pull creation with empty changes (#7920) (#7926)
BUILD
- Drone/docker: prepare multi-arch release + provide arm64 image (#7571) (#7884)

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