Update vecgeom version to 2.1.1

[akritkbehera]

No description provided.

[akritkbehera]

please test

[cmsbuild]

A new Pull Request was created by @akritkbehera for branch IB/CMSSW_20_1_X/master.

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

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9a9785/54886/summary.html
COMMIT: 7750a6b
CMSSW: CMSSW_20_1_X_2026-07-23-1100/el9_amd64_gcc13
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmsdist/10739/54886/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 120 lines from the logs
• Reco comparison results: 44447 differences found in the comparisons
• DQMHistoTests: Total files compared: 45
• DQMHistoTests: Total histograms compared: 3559760
• DQMHistoTests: Total failures: 421170
• DQMHistoTests: Total nulls: 291
• DQMHistoTests: Total successes: 3138281
• DQMHistoTests: Total skipped: 18
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 44 files compared)
• Checked 195 log files, 163 edm output root files, 45 DQM output files
• TriggerResults: found differences in 12 / 44 workflows

Max Memory Comparisons exceeding threshold

@cms-sw/core-l2 , I found 8 workflow step(s) with memory usage exceeding the error threshold:

Expand to see workflows ...

• Error: Workflow 12834.0_TTbar_14TeV+2024 step5 max memory diff -349.1 exceeds +/- 30.0 MiB
• Error: Workflow 17034.96_TTbar_14TeV+2025PU_HybridPUS1S2 step3 max memory diff 33.7 exceeds +/- 30.0 MiB
• Error: Workflow 34434.0_TTbar_14TeV+Run4D121 step1 max memory diff -44.1 exceeds +/- 30.0 MiB
• Error: Workflow 34434.0_TTbar_14TeV+Run4D121 step5 max memory diff -56.7 exceeds +/- 30.0 MiB
• Error: Workflow 34434.75_TTbar_14TeV+Run4D121_HLT75e33Timing step1 max memory diff -44.1 exceeds +/- 30.0 MiB
• Error: Workflow 34634.0_TTbar_14TeV+Run4D121PU step2 max memory diff -109.7 exceeds +/- 30.0 MiB
• Error: Workflow 34634.0_TTbar_14TeV+Run4D121PU step3 max memory diff -134.9 exceeds +/- 30.0 MiB
• Error: Workflow 34634.0_TTbar_14TeV+Run4D121PU step1 max memory diff -44.1 exceeds +/- 30.0 MiB