[Bitbucket] Fixed error_msg concatenation error in raise_for_status

[Viktxrrr]

Fixes #1481

[Spacetown]

Added the fix suggested in #1481

Can you change the description to Fixes #14841? This will close the issue if the PR is merged without a manual interaction.

[Viktxrrr]

Added the fix suggested in #1481

Can you change the description to Fixes #14841? This will close the issue if the PR is merged without a manual interaction.

Done

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 34.09%. Comparing base (85eea47) to head (53e6d0a).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
atlassian/bitbucket/cloud/base.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1493      +/-   ##
==========================================
+ Coverage   34.07%   34.09%   +0.01%     
==========================================
  Files          46       46              
  Lines        8754     8755       +1     
  Branches     1235     1336     +101     
==========================================
+ Hits         2983     2985       +2     
  Misses       5647     5647              
+ Partials      124      123       -1     

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