[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 

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[fr33m0nk]

@vil02https://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?