mangled versions are not findable on the server

[umlaeute]

when uploading a package with a version containing a mangled character like _ (e.g. 0.10.10-32-g2e842763_docker as in XXX-deken-test[v0.10.10-32-g2e842763_docker](Darwin-ppc-32)(Linux-alpha-32)(Linux-s390x-32)(Linux-s390x-64)(Windows-i386-64).dek), the deken-server will only report the mangled version (here 0.10.10-32-g2e842763~docker).

this breaks the deken CI-jobs (e.g. here), that will check the unmangled version like so:

deken find XXX-deken-test==0.10.10-32-g2e842763~docker

also reported to the deken-server as https://git.iem.at/zmoelnig/deken-server/-/issues/31