ci(e2e): pin npm to avoid docker failure

[oXtxNt9U]

Summary

nodejs/node#62425
npm/cli#9151

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.67%. Comparing base (b741d97) to head (db85a9c).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1260      +/-   ##
===========================================
+ Coverage    53.37%   53.67%   +0.30%     
===========================================
  Files         1127     1130       +3     
  Lines        62916    63346     +430     
  Branches      1723     1800      +77     
===========================================
+ Hits         33580    34004     +424     
- Misses       29207    29211       +4     
- Partials       129      131       +2     

Flag	Coverage Δ
contracts	98.60% <ø> (?)
packages	53.37% <ø> (ø)

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