test: enforce strict mode in test-zlib-const

[Trott]

Instead of checking that assignments fail silently in sloppy mode, check that they throw in strict mode.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.21%. Comparing base (01dd7c4) to head (d7b39d1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #56689      +/-   ##
==========================================
- Coverage   89.21%   89.21%   -0.01%     
==========================================
  Files         662      662              
  Lines      191934   191934              
  Branches    36953    36947       -6     
==========================================
- Hits       171242   171234       -8     
- Misses      13536    13542       +6     
- Partials     7156     7158       +2     

see 37 files with indirect coverage changes

[Trott]

I rebased to pull in 01dd7c4 from main to fix the unrelated failing tests. Re-approvals would be welcome.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/64609/