fix: add missing newline to common labels

[Moglum]

Addresses #9503

Fixes newline between built-in and additional labels specified via app.labels

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[floreks]

thanks! I will do the release shortly

[maciaszczykm]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floreks, maciaszczykm, Moglum

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.08%. Comparing base (6c9cfce) to head (6d7440d).
Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9504      +/-   ##
==========================================
- Coverage   37.09%   37.08%   -0.01%     
==========================================
  Files         283      283              
  Lines       11830    11830              
  Branches      183      183              
==========================================
- Hits         4388     4387       -1     
- Misses       7220     7221       +1     
  Partials      222      222