Changes to use f-strings instead of format and clean up

[joachimmetz]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.17%. Comparing base (ade876e) to head (c4d6307).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
plaso/parsers/text_plugins/atlassian_confluence.py	78.94%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5039   +/-   ##
=======================================
  Coverage   85.17%   85.17%           
=======================================
  Files         434      434           
  Lines       39082    39086    +4     
=======================================
+ Hits        33287    33291    +4     
  Misses       5795     5795           

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