Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 

Installing:
 dnf5                x86_64        5.1.12-1.fc40         copr_base        581 k
     replacing  dnf.noarch 4.19.0-1.fc40
     replacing  yum.noarch 4.19.0-1.fc
During the bootstrap, dnf5 package from the dnf5-testing Copr repository is being installed. This package contains an obsoletion of the dnf package.