fix: add BigInt to type aliases

[rubiesonthesky]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: bigint is not added to types when adding missing types #1482
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Fixes missing bigint types (finally) 🎉

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.62%. Comparing base (e484ffc) to head (0355e63).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1513   +/-   ##
=======================================
  Coverage   78.62%   78.62%           
=======================================
  Files         175      175           
  Lines       10957    10959    +2     
  Branches     1021     1021           
=======================================
+ Hits         8615     8617    +2     
  Misses       2338     2338           
  Partials        4        4           

Flag	Coverage Δ
mutation	73.25% <100.00%> (+<0.01%)	⬆️
unit	28.38% <100.00%> (+0.01%)	⬆️

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[JoshuaKGoldberg]

Yay! Thanks! ✨