fix: Updated @open-rpc/schema-utils-js to 2.1.2

[JakeShirley]

@open-rpc/schema-utils-js 2.1.2 specifically fixes a bug I am hitting locally so I thought a bump to the latest wouldn't hurt.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.25%. Comparing base (06b6373) to head (d81a4e6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #735   +/-   ##
=======================================
  Coverage   99.25%   99.25%           
=======================================
  Files           6        6           
  Lines         267      267           
  Branches       30       30           
=======================================
  Hits          265      265           
  Misses          2        2           

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