chore: update codecov/codecov-action to v4

[vil02]

Same as TheAlgorithms/Rust#670 - it contains the description of the problem.

Before merging, please add the token from https://app.codecov.io/gh/TheAlgorithms/Java/settings as CODECOV_TOKEN into the repo secrets, including dependabot secrets.Token is added.

@siriak - your help will be needed here.

Continuation of #5098.

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.11%. Comparing base (ab094ef) to head (ee1ad00).

Additional details and impacted files

@@ Coverage Diff @@## master #5100 +/- ##
============================================
- Coverage 37.13% 37.11% -0.02% + Complexity 2331 2330 -1 
============================================
Files 517 517 Lines 15645 15645 Branches 2984 2984 ============================================
- Hits 5809 5807 -2 - Misses 9548 9549 +1 - Partials 288 289 +1 

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[siriak]

I have added the token to actions and dependabot sections. Is it ready to be merged or you want to test something?

[vil02]

I have added the token to actions and dependabot sections. Is it ready to be merged or you want to test something?

Thanks. It is ready to be merged.