Vendor xdrlib

[MatthieuDartiailh]

Python 3.13 removes xdrlib so we will simply vendor the module.

[codecov]

Codecov Report

Attention: 108 lines in your changes are missing coverage. Please review.

Comparison is base (09d9c67) 24.22% compared to head (b60ba92) 24.81%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #402      +/-   ##
==========================================
+ Coverage   24.22%   24.81%   +0.59%     
==========================================
  Files          24       25       +1     
  Lines        3356     3526     +170     
  Branches      469      490      +21     
==========================================
+ Hits          813      875      +62     
- Misses       2524     2632     +108     
  Partials       19       19              

Flag	Coverage Δ
unittests	24.81% <36.84%> (+0.59%)	⬆️

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Files	Coverage Δ
pyvisa_py/protocols/rpc.py	21.99% <100.00%> (ø)
pyvisa_py/protocols/xdrlib.py	36.47% <36.47%> (ø)

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