found 834685 1.3.0-5 thanks Still happening in this version. If you need a build log, just say so, but this was already diagnosed in the past as indicated by the changelog.
Now the changelog entry for 1.3.0-4 has disappeared (?), and the changelog entry for 1.3.0-5 says again "Added gnupg as build-depends". The debian/control file, however, still does not have gnupg anywhere.