Update codecov-action@v2 to codecov-action@v3

[gaugup]

This helps resolve the following warning:-

[github-actions]

Unit Test Results

286 tests  ±0   284 ✔️ ±0   9m 21s ⏱️ +34s
    1 suites ±0       2 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 3e767b9. ± Comparison against base commit d78b4bc.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d78b4bc) 68.27% compared to head (3e767b9) 68.27%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #370   +/-   ##
=======================================
  Coverage   68.27%   68.27%           
=======================================
  Files          27       27           
  Lines        3603     3603           
=======================================
  Hits         2460     2460           
  Misses       1143     1143           

Flag	Coverage Δ
unittests	68.27% <ø> (ø)

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