fix: remove deprecation for implicitly nullable parameter types (replacement)

[karel-rehor]

Replaces #161

Proposed Changes

Remove deprecation for implicitly nullable parameter types since php 8.4

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• make test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.09%. Comparing base (1b59d57) to head (6f6bc8f).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #164   +/-   ##
=========================================
  Coverage     75.09%   75.09%           
- Complexity      433      437    +4     
=========================================
  Files            25       25           
  Lines          1104     1104           
=========================================
  Hits            829      829           
  Misses          275      275           

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[alespour]

simple change, tests pass -> LGTM