chore: pythia8-8.311

This PR updates pythia8 to 8.311.

assigned to @wdconinc

added 1 commit

• 8d424eab - chore: pythia8-8.311

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changed title from chore: spack cherry-pick: pythia8: new version 8.311 to chore: pythia8-8.311

requested review from @veprbl

enabled an automatic merge when the pipeline for 8d424eab succeeds

aborted the automatic merge because target branch was updated

added 5 commits

• 8d424eab...dfbc782b - 3 commits from branch master
• 8a961be9 - chore: spack cherry-pick: pythia8: new version 8.311
• e4334215 - chore: pythia8-8.311

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merged