Sanitize the refnames so it's possible to clone and work with e.g. GMP repository.
Reproducer: 1. git clone hg::https://gmplib.org/repo/gmp/
During the processing in previous releases an error msg could be seen (clonning is usually finished without problematic branches.
Updates may require up to 24 hours to propagate to mirrors. If the following command doesn't work, please retry later:
sudo dnf upgrade --refresh --advisory=FEDORA-2020-b49208e855
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