Set additionalProperties to False on Extra.forbid models

[Code0x58]

Change Summary

Set "additionalProperties": False on schema for models with Config.extra == Extra.forbid.

Checklist

• Unit tests for the changes exist
• Tests pass on CI and coverage remains at 100%
• Documentation reflects the changes where applicable
• changes/796-Code0x58.rst file added describing change

[codecov]

Codecov Report

Merging #796 into master will decrease coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #796      +/-   ##
==========================================
- Coverage     100%   99.92%   -0.08%     
==========================================
  Files          17       17              
  Lines        2846     2848       +2     
  Branches      559      560       +1     
==========================================
  Hits         2846     2846              
- Misses          0        2       +2

Impacted Files	Coverage Δ
pydantic/schema.py	100% <100%> (ø)	⬆️
pydantic/main.py	99.48% <0%> (-0.52%)	⬇️

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[samuelcolvin]

great, thanks.