Modernize

[matteosox]

Summary

Moderrnize the repo to latest tools, upgrade Python, and incorporate suggested fix to EdgeNode.disconnect().

Why?

Movin' on up!

How?

• Add support for Python 3.13.
• Remove support for Python 3.8.
• Stop testing for pypy.
• Remove docker.
• Modernize to uv.
• Simplify release process and docs.
• Incorporate fix from this PR resolving an issue with EdgeNode.disconnect().

If you have any questions not answered by a quick readthrough of the contributor guide, add them to this PR and submit it.

[codecov]

Codecov Report

Attention: Patch coverage is 71.11111% with 13 lines in your changes missing coverage. Please review.

Project coverage is 58.42%. Comparing base (e889f0c) to head (e99eeab).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pysparkplug/_edge_node.py	0.00%	7 Missing ⚠️
src/pysparkplug/_payload.py	66.66%	4 Missing ⚠️
src/pysparkplug/_datatype.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   60.63%   58.42%   -2.21%     
==========================================
  Files          16       17       +1     
  Lines         719      777      +58     
  Branches      105       72      -33     
==========================================
+ Hits          436      454      +18     
- Misses        276      317      +41     
+ Partials        7        6       -1     

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