ci(codecov): change codecov argument due to upgrade to v5

[pat-pan]

What this PR does / why we need it

This PR is to change the Codecov argument from file to files to accommodate the breaking change in Codecov V5

Which issue(s) this PR resolves / fixes

Resolves / Fixes #<issue_id>

This PR updates the Codecov arguments manually to accommodate the changes introduced in #158, which upgrades the Codecov version to V5.

Please check the following list

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.68%. Comparing base (abdecc3) to head (eadacba).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #169   +/-   ##
=======================================
  Coverage   81.68%   81.68%           
=======================================
  Files          35       35           
  Lines        1103     1103           
  Branches      128      128           
=======================================
  Hits          901      901           
  Misses        146      146           
  Partials       56       56           

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[Wwwsylvia]

LGTM