Make custom annotation generation deterministic

[vidit2606]

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• Code Change
• Example/Test Code Change

Validation

• Have you ran tox?
• Do the tests pass?

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 51.93%. Comparing base (e242f7f) to head (e70d4d6).

Files	Patch %	Lines
stone/backends/python_types.py	75.00%	1 Missing ⚠️
stone/cli.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #325   +/-   ##
=======================================
  Coverage   51.93%   51.93%           
=======================================
  Files          37       37           
  Lines        8415     8418    +3     
  Branches     1807     1809    +2     
=======================================
+ Hits         4370     4372    +2     
- Misses       3729     3730    +1     
  Partials      316      316           

Flag	Coverage Δ
unit	51.93% <60.00%> (+<0.01%)	⬆️

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