Release candidate 2.2.2

[danielhuppmann]

Description of PR

Add to release notes and some ruff-formatting updates

[codecov]

Codecov Report

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

Project coverage is 95.0%. Comparing base (ddbb88e) to head (f380252).
Report is 16 commits behind head on main.

❗ Current head f380252 differs from pull request most recent head e5fe2e0. Consider uploading reports for the commit e5fe2e0 to get more accurate results

Files	Patch %	Lines
pyam/statistics.py	0.0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #851   +/-   ##
=====================================
  Coverage   95.0%   95.0%           
=====================================
  Files         64      63    -1     
  Lines       6134    6158   +24     
=====================================
+ Hits        5828    5851   +23     
- Misses       306     307    +1     

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