fix: add deny_unknown_fields to nested structs

[laststylebender14]

Summary:
Briefly describe the changes made in this PR.

Issue Reference(s):
Fixes #... (Replace "..." with the issue number)

Build & Testing:

• I ran cargo test successfully.
• I have run ./lint.sh --mode=fix to fix all linting issues raised by ./lint.sh --mode=check.

Checklist:

• I have added relevant unit & integration tests.
• I have updated the documentation accordingly.
• I have performed a self-review of my code.
• PR follows the naming convention of <type>(<optional scope>): <title>

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.53%. Comparing base (e6b3688) to head (17b6827).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2666      +/-   ##
==========================================
+ Coverage   86.49%   86.53%   +0.03%     
==========================================
  Files         252      252              
  Lines       24283    24353      +70     
==========================================
+ Hits        21003    21073      +70     
  Misses       3280     3280              

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