Do not write any escaped surrogate pairs to inference JSONs

[Enkidu93]

Fixes sillsdev/machine.py#276

This is a follow-up on #744. Unbeknownst to me at the time, the solution in that PR only works as expected for characters within the BMP 🫤 . We recently had some text written using classical Chinese Characters that are not in the BMP.

---

This change is 

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.01%. Comparing base (bbb6e5d) to head (53d0d8a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #888   +/-   ##
=======================================
  Coverage   67.01%   67.01%           
=======================================
  Files         384      384           
  Lines       21036    21036           
  Branches     2734     2734           
=======================================
  Hits        14098    14098           
  Misses       5962     5962           
  Partials      976      976           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[ddaspit]

@ddaspit reviewed 4 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on Enkidu93).

[Enkidu93]

Do you think this is worthy of a hotfix, @ddaspit?