feat(strict): use standard assert for Node.js legacy versions

[wellwelwel]

Fixes #760.

This approach avoids MODULE_NOT_FOUND in Node.js < 16. Instead, it uses the standard assert.

• No changes for Bun and Deno.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.02%. Comparing base (130dadb) to head (6ad48de).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #761      +/-   ##
==========================================
- Coverage   99.08%   99.02%   -0.06%     
==========================================
  Files          36       36              
  Lines        1742     1742              
  Branches       10       10              
==========================================
- Hits         1726     1725       -1     
  Misses          8        8              
- Partials        8        9       +1     

Flag	Coverage Δ
linux	98.96% <100.00%> (ø)
osx	98.96% <100.00%> (-0.06%)	⬇️
windows	98.96% <100.00%> (ø)

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