[13_0_X] Bump cepgen version to 1.2.5

[forthommel]

This release, among other things, fixes the missing particles status code propagation to the HepMC2 event content noticed by @bbilin, and documented in cepgen/cepgen#88.

Backport of #9305.

FYI: @bbilin

[cmsbuild]

A new Pull Request was created by @forthommel for branch IB/CMSSW_13_0_X/master.

@aandvalenzuela, @cmsbuild, @iarspider, @smuzaffar can you please review it and eventually sign? Thanks.
@antoniovilela, @mandrenguyen, @rappoccio, @sextonkennedy you are the release manager for this.
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[cmsbuild]

cms-bot internal usage

[bbilin]

@cmsbuild please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7c755d/40506/summary.html
COMMIT: 15fbb96
CMSSW: CMSSW_13_0_X_2024-07-14-0000/el8_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmsdist/9307/40506/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 12 lines to the logs
• Reco comparison results: 10 differences found in the comparisons
• DQMHistoTests: Total files compared: 49
• DQMHistoTests: Total histograms compared: 3283624
• DQMHistoTests: Total failures: 9
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3283593
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 48 files compared)
• Checked 213 log files, 164 edm output root files, 49 DQM output files
• TriggerResults: no differences found

[smuzaffar]

+externals

@cms-sw/orp-l2 , feel free to merge it for 13.0.X IBs

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_13_0_X/master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @sextonkennedy, @rappoccio, @antoniovilela, @mandrenguyen (and backports should be raised in the release meeting by the corresponding L2)

[antoniovilela]

+1