remove threshold after bug fix (#5938)

Co-authored-by: = <=>
Co-authored-by: Long Hao <[email protected]>

Author: ayachensiyuan

codecov.yml

@@ -7,7 +7,6 @@ coverage:
     project:
       default:
         target: auto   # require coverage equal or more than current
-        threshold: 0.2%
         if_ci_failed: error #success, failure, error, ignore      
 
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