docs: fix incorrect file references in CONTRIBUTING.md

[abhayrajjais01]

Description

Problem

CONTRIBUTING.md contains two outdated file references:

1. Line 44: References dev_requirements.txt which doesn't exist in the repository
2. Line 236: References HISTORY.rst but the actual file is
   HISTORY.md

Changes

• Updated the dev_requirements.txt reference to correctly point to
  pyproject.toml which contains the optional [dev,docs] dependencies
• Fixed HISTORY.rst →
  HISTORY.md to match the actual filename

Related Issue(s)

AI-Assisted Development

• I understand all the code I'm submitting

AI tools used (if applicable):

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.35%. Comparing base (3146b96) to head (a4d5bae).
⚠️ Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1299      +/-   ##
==========================================
- Coverage   87.89%   87.35%   -0.54%     
==========================================
  Files          20       21       +1     
  Lines        2776     2808      +32     
==========================================
+ Hits         2440     2453      +13     
- Misses        336      355      +19     

Flag	Coverage Δ
unittests	87.35% <ø> (-0.54%)	⬇️

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[henrykironde]

@abhayrajjais01, thank you for this PR