fix(oidc): expire stored login nonces

[nijel]

Bound unfinished login attempts and reject expired nonces to prevent indefinite retention. Stop storing LinkedIn nonces that are never validated and provide shared association expiry checks for storage integrations.

Fixes python-social-auth/social-app-django#918

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-06T12:47:25.482977Z	7d3a2b3	New commits
🔒 Security Review	✅ Completed 2026-10-06T12:28:29.661893Z	eb99ee8	PR opened

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.30%. Comparing base (32b342f) to head (7d3a2b3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2066      +/-   ##
==========================================
+ Coverage   96.29%   96.30%   +0.01%     
==========================================
  Files         369      370       +1     
  Lines       20659    20753      +94     
  Branches     1197     1207      +10     
==========================================
+ Hits        19893    19987      +94     
  Misses        565      565              
  Partials      201      201              

Flag	Coverage Δ
unittests	96.30% <100.00%> (+0.01%)	⬆️

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[chatgpt-codex-connector]

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Reviewed commit: eb99ee8d8e

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