Revert "Fedora: Install krb5 package from updates-testing repo"

This reverts commit d1c81e86.

krb5 1.18.2 was promoted to the "updates" repository.
1 job for !71 with mnowak/revert-fedora-add-krb5-from-testing-repo in 5 minutes and 11 seconds
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Status Job ID Name Coverage
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passed #984733
amd64 linux docker
fedora:32:amd64:docker

00:05:11