🔖 Bump version to 0.6.5

[marcelwa]

Description

Version bump to 0.6.5.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have added a changelog entry.
• I have created/adjusted the Python bindings for any new or updated functionality.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.21%. Comparing base (73999a4) to head (a746b00).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #549      +/-   ##
==========================================
- Coverage   98.22%   98.21%   -0.01%     
==========================================
  Files         228      228              
  Lines       35706    35706              
  Branches     1692     1691       -1     
==========================================
- Hits        35071    35069       -2     
- Misses        635      637       +2     

see 2 files with indirect coverage changes

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