Adjust for sdmx1 v2.24.0

[khaeru]

sdmx1 version 2.24.0 was released 2025-12-18. It obviates some fixes included here, but also adjusts the default behaviour for incrementing versions. This PR adjusts.

Also:

• Zenodo recently tightened rate limits for some API actions; see here. This causes some tests to be flaky: if the ratelimit is hit, all subsequent queries to the API fail.
  The PR works around this issue by retrying with a delay. A more robust fix would be to rate limit the requests in the code itself.

PR checklist

• Checks all ✅
• Update documentation
• Update doc/whatsnew.rst

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.12%. Comparing base (09ecca7) to head (1016e39).

Files with missing lines	Patch %	Lines
transport_data/util/pooch.py	92.30%	6 Missing ⚠️
transport_data/tests/test_store.py	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   94.13%   91.12%   -3.01%     
==========================================
  Files          65       65              
  Lines        3016     3427     +411     
==========================================
+ Hits         2839     3123     +284     
- Misses        177      304     +127     

Files with missing lines	Coverage Δ
transport_data/ato/cli.py	87.50% <100.00%> (+0.83%)	⬆️
transport_data/org/__init__.py	100.00% <100.00%> (ø)
transport_data/org/cli.py	97.29% <100.00%> (-0.04%)	⬇️
transport_data/store.py	74.28% <100.00%> (-25.72%)	⬇️
transport_data/testing/__init__.py	100.00% <ø> (ø)
transport_data/tests/org/test_metadata.py	100.00% <100.00%> (ø)
transport_data/tests/test_ato.py	100.00% <100.00%> (ø)
transport_data/tests/test_store.py	94.23% <57.14%> (-5.77%)	⬇️
transport_data/util/pooch.py	94.28% <92.30%> (-5.72%)	⬇️

... and 2 files with indirect coverage changes

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