[type:fix] fix brpc integration testing response size

[847850277]

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #4784 (eeb36cc) into master (c275a94) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4784      +/-   ##
============================================
+ Coverage     65.66%   65.68%   +0.01%     
- Complexity     8143     8145       +2     
============================================
  Files          1133     1133              
  Lines         33139    33139              
  Branches       2966     2966              
============================================
+ Hits          21762    21766       +4     
+ Misses         9646     9642       -4     
  Partials       1731     1731              

see 2 files with indirect coverage changes

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