[backend-comparison] Update Github App ID with official application

[syl20bnr]

Checklist

• Confirmed that run-checks all script has been executed.
• Made sure the book is up to date with changes in this PR.

Related Issues/PRs

#1072

Changes

Change the client ID to the official Github App ID.
Official GitHub app link: https://github.com/apps/burnbench

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.52%. Comparing base (3d93e6d) to head (bba1bd3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1397   +/-   ##
=======================================
  Coverage   85.52%   85.52%           
=======================================
  Files         594      594           
  Lines       68226    68252   +26     
=======================================
+ Hits        58348    58374   +26     
  Misses       9878     9878           

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