Update Instant.toZonedDateTime{,ISO}.

[Ms2ger]

See #889.

[codecov]

Codecov Report

Merging #1115 into main will decrease coverage by 3.43%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1115      +/-   ##
==========================================
- Coverage   93.55%   90.12%   -3.44%     
==========================================
  Files          19       17       -2     
  Lines        7961     8223     +262     
  Branches     1264     1190      -74     
==========================================
- Hits         7448     7411      -37     
- Misses        506      801     +295     
- Partials        7       11       +4     

Flag	Coverage Δ
test262	?
tests	90.12% <ø> (+0.68%)	⬆️

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Impacted Files	Coverage Δ
polyfill/lib/slots.mjs
polyfill/lib/now.mjs
polyfill/lib/intrinsicclass.mjs
polyfill/lib/regex.mjs
polyfill/lib/temporal.mjs
polyfill/lib/shim.mjs
polyfill/lib/intl.mjs
polyfill/lib/legacydate.mjs
lib/zoneddatetime.mjs	79.34% <0.00%> (ø)
lib/intrinsicclass.mjs	56.81% <0.00%> (ø)
... and 15 more

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[ryzokuken]

Great, thanks!