Feat/add caching tests

[elewis2]

• adds tests for caching and rate limiting
• removes [sqlite] from requests-cache requirement and fixes version at 1.3.3, to avoid zc.buildout error

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.04%. Comparing base (1353ca1) to head (cb69cd6).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #124      +/-   ##
===========================================
+ Coverage    87.81%   88.04%   +0.22%     
===========================================
  Files           18       18              
  Lines         2635     2635              
===========================================
+ Hits          2314     2320       +6     
+ Misses         321      315       -6     

Flag	Coverage Δ
unittests	88.04% <ø> (+0.22%)	⬆️

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[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved review issues were identified.

Review effort: Lite
Findings: None

What changed in this PR

Adds GraphKB caching and rate-limiting tests, and pins requests-cache to version 1.3.3.

Changes:

• Adds cache filtering and cache behavior tests.
• Adds rate-limiting configuration tests.
• Removes the SQLite extra from requests-cache.

File	Description
tests/​test_graphkb/​test_util.py	Adds caching and rate-limiting tests.
setup.cfg	Pins requests-cache to version 1.3.3.

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