docs: edited the badge

[Lubov66]

What is the purpose of the change?

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.79%. Comparing base (93cfa82) to head (64f2414).

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15307      +/-   ##
============================================
+ Coverage     60.78%   60.79%   +0.01%     
  Complexity    10923    10923              
============================================
  Files          1886     1886              
  Lines         86129    86129              
  Branches      12903    12903              
============================================
+ Hits          52350    52359       +9     
+ Misses        28322    28317       -5     
+ Partials       5457     5453       -4     

Flag	Coverage Δ
integration-tests	33.19% <ø> (-0.01%)	⬇️
samples-tests	29.22% <ø> (-0.04%)	⬇️
unit-tests	58.91% <ø> (-0.03%)	⬇️

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