chore: update codecov config

[xushiyan]

Description

Update codecov config to give 5% leniency for project and 10% leniency for PRs.

How are the changes test-covered

• N/A
• Automated tests (unit and/or integration tests)
• Manual tests
  • Details are described below

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.50%. Comparing base (dbd7d87) to head (5bd82b0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #245   +/-   ##
=======================================
  Coverage   92.50%   92.50%           
=======================================
  Files          29       29           
  Lines        1361     1361           
=======================================
  Hits         1259     1259           
  Misses        102      102           

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