[cms-common] Always use SCRAM V2 for slc6

[smuzaffar]

No description provided.

[smuzaffar]

please test

[cmsbuild]

A new Pull Request was created by @smuzaffar for branch IB/CMSSW_14_1_X/master.

@aandvalenzuela, @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

[cmsbuild]

Pull request #9375 was updated.

[smuzaffar]

+externals

Merging it as jenkins is busy and tests will take hours to finish. I have tested it locally and now scram V2 is used for slc6

• slc6, rhel6:

> singularity exec -i -B /cvmfs /cvmfs/singularity.opensciencegrid.org/cmssw/cms:rhel6-itb-x86_64 bash
Apptainer> source w/cmsset_default.sh 
Apptainer> scram v
V2_2_9_pre22

• slc7, rhel7:

> singularity exec -i -B /cvmfs /cvmfs/singularity.opensciencegrid.org/cmssw/cms:rhel7-itb-x86_64 bash
Apptainer> source w/cmsset_default.sh 
Apptainer> scram v
V3_00_75

• rhel8, el8:

> singularity exec -i -B /cvmfs /cvmfs/singularity.opensciencegrid.org/cmssw/cms:rhel8-itb-x86_64 bash
Apptainer> source w/cmsset_default.sh 
Apptainer> scram v
V3_00_75

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_14_1_X/master IBs after it passes the integration tests. This pull request will now be reviewed by the release team before it's merged. @mandrenguyen, @sextonkennedy, @rappoccio, @antoniovilela (and backports should be raised in the release meeting by the corresponding L2)