fix: specific pr target for pr title checker

[shawnh2]

fix ci failed in https://github.com/GreptimeTeam/gtctl/actions/runs/6446632743/job/17513197870?pr=159

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (dda81be) 34.54% compared to head (35669fc) 34.75%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #163      +/-   ##
===========================================
+ Coverage    34.54%   34.75%   +0.21%     
===========================================
  Files           10       10              
  Lines         1297     1315      +18     
===========================================
+ Hits           448      457       +9     
- Misses         760      766       +6     
- Partials        89       92       +3     

see 1 file with indirect coverage changes

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