Pin anyio version to below 4.0.0

[lrafeei]

This PR pins framework_starlette: anyio to < v4.0.0

anyio is used for test_exception_in_middleware test in Starlette: Kludex/starlette#1157
However, v4.0.0 of anyio creates breaking changes to our tests (but not the instrumentation): https://github.com/agronholm/anyio/releases/tag/4.0.0

This should be kept in our tests until Starlette v0.17.0 is no longer within New Relic's support window (January 23, 2024)

[github-actions]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.45%. Comparing base (faaccd0) to head (56ff7c5).
⚠️ Report is 1011 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #916      +/-   ##
==========================================
- Coverage   81.47%   81.45%   -0.02%     
==========================================
  Files         186      186              
  Lines       18700    18700              
  Branches     3278     3278              
==========================================
- Hits        15235    15233       -2     
  Misses       2533     2533              
- Partials      932      934       +2     

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