[maven-release-plugin] prepare release github-1.15.0
[maven-release-plugin] prepare release github-1.15.0

fbelzunc/github-plugin,OpenDataSpace/github-plugin,lanwen/github-plugin,lanwen/github-plugin,fbelzunc/github-plugin,recena/github-plugin,recena/github-plugin,OpenDataSpace/github-plugin,ouaibsky/github-plugin,recena/github-plugin,ouaibsky/github-plugin,jenkinsci/github-plugin,ouaibsky/github-plugin,fbelzunc/github-plugin,OpenDataSpace/github-plugin,jenkinsci/github-plugin,lanwen/github-plugin,jenkinsci/github-plugin