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: 
Failed to resolve the transaction:
Package "pyproject-rpm-macros-1.18.1-1.fc43.noarch" is already installed.
Package "python3-pytest-8.3.5-2.fc43.noarch" is already installed.
Package "python3-pytest-cov-5.0.0-2.fc43.noarch" is already installed.
Package "python3-packaging-25.0-1.fc43.noarch" is already installed.
Package "python3-setuptools-78.1.0-1.fc43.noarch" is already installed.
Problem: cannot install both python3-packaging-24.2-3.fc42.noarch from fedora and python3-packaging-25.0-1.fc43.noarch from @System
  - cannot install the best candidate for the job
  - conflicting requests
Describes the failed transaction.