release: 2.74.1+ubuntu xx.xx.3 (deb only release)

[ernestl]

Follow up on #16794 with cherry-picked fixes:

• Revert incorrect deb version generation fix: revert: mkversion.sh correct for deb release flow #16814 (+ have to use symlink)
• Fix Autopkgtests spread install issue: packaging: update spread installation for autopkgtests to use github.com/canonical/spread #16812

Requires rebase merge

[bboozzoo]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.49%. Comparing base (348a3fe) to head (cb061a7).
⚠️ Report is 2 commits behind head on release/2.74.

Additional details and impacted files

@@               Coverage Diff                @@
##           release/2.74   #16816      +/-   ##
================================================
- Coverage         77.49%   77.49%   -0.01%     
================================================
  Files              1343     1343              
  Lines            184294   184294              
  Branches           2444     2444              
================================================
- Hits             142816   142810       -6     
- Misses            32833    32843      +10     
+ Partials           8645     8641       -4     

Flag	Coverage Δ
unittests	77.49% <ø> (-0.01%)	⬇️

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[github-actions]

Tue Mar 24 11:31:53 UTC 2026

Spread tests skipped