[DO NOT MERGE before adding the token] chore: update 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/Clojure/settings as CODECOV_TOKEN into the repo secrets.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.57%. Comparing base (a9c5bec) to head (c5c6056).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #29   +/-   ##
=======================================
  Coverage   96.57%   96.57%           
=======================================
  Files          21       21           
  Lines         321      321           
  Branches       10       10           
=======================================
  Hits          310      310           
  Misses          1        1           
  Partials       10       10           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[fr33m0nk]

@vil02 https://app.codecov.io/gh/TheAlgorithms/Clojure/settings results in Not found

[vil02]

@fr33m0nk you do not have access to it. Who else can edit secrets of this repository?