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 main in 3 minutes and 39 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Images
passed #985413
amd64 linux docker
fedora:32:amd64:docker

00:03:39