Update Rust crate bon to v3.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
bon (source)	dependencies	minor	=3.0.2 -> =3.1.0

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Release Notes

elastio/bon (bon)

v3.1.0

Compare Source

Added

• Add #[builder(field)] to define custom private fields on the builder type. See Custom Fields guide for details (#​207)

Other

• Internal refactoring of naming in bons test suite (#​215)

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.50%. Comparing base (b3aada8) to head (8b36b1c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10066      +/-   ##
==========================================
- Coverage   89.51%   89.50%   -0.01%     
==========================================
  Files         295      295              
  Lines       31195    31195              
==========================================
- Hits        27923    27922       -1     
- Misses       3272     3273       +1     

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