Docs update for 2.5.4 release & copyright to 2026

[kingthorin]

No description provided.

[what-the-diff]

PR Summary

• Updated Copyright Year
  The copyright year in several documents has been updated from 2025 to 2026.

• Added Note Regarding Versioning
  A cautionary note was added to the Release Process document. This note emphasizes the importance of correctly incrementing the minor version number for new software releases.

• New Release Notes
  Release notes have been compiled for the new 2.5.4 version. It includes information on various upgrades such as support for the Ukrainian language in Commerce Provider, better address generation for Ireland, additional data providers and fixes in existing data.

• Updated Version Numbers
  The software's version number in the documentation configuration file has been updated to reflect the new version - 2.5.4 and upcoming version - 2.6.0.

• Link to New Release Notes
  A link to these new release notes has been added to the documentation's page tree for easy access.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.43%. Comparing base (9575f6a) to head (76add2a).
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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1760      +/-   ##
============================================
+ Coverage     92.27%   92.43%   +0.16%     
- Complexity     3437     3443       +6     
============================================
  Files           338      338              
  Lines          6785     6785              
  Branches        670      670              
============================================
+ Hits           6261     6272      +11     
+ Misses          356      351       -5     
+ Partials        168      162       -6     

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[kingthorin]

@asolntsev I'd suggest renaming the current 2.6.0 milestone ➡️ 2.5.4 and creating a new 2.6.0 then things should be assigned/tagged correctly.