chore: remove duplicate test deps

[mgorny]

Summary of Changes

Remove duplicate listing of httpx and uvicorn in test deps.

Related Issues

n/a

Pull Request Checklist

• [x] Applied changes to both WSGI and ASGI code paths and interfaces (where applicable).
• [x] Added tests for changed code.
• [x] Prefixed code comments with GitHub nick and an appropriate prefix.
• [x] Coding style is consistent with the rest of the framework.
• [x] Updated documentation for changed code.
  • [x] Added docstrings for any new classes, functions, or modules.
  • [x] Updated docstrings for any modifications to existing code.
  • [x] Updated both WSGI and ASGI docs (where applicable).
  • [x] Added references to new classes, functions, or modules to the relevant RST file under docs/.
  • [x] Updated all relevant supporting documentation files under docs/.
  • [x] A copyright notice is included at the top of any new modules (using your own name or the name of your organization).
  • [x] Changed/added classes/methods/functions have appropriate versionadded, versionchanged, or deprecated directives.
• [ ] Changes (and possible deprecations) have towncrier news fragments under docs/_newsfragments/, with the file name format {issue_number}.{fragment_type}.rst. (Run towncrier --draft to ensure it renders correctly.)

[mgorny]

I think this doesn't really deserve a news fragment but please correct me if I'm wrong.

[codecov[bot]]

Codecov Report

Merging #1916 (e45d0e5) into master (3fa87c5) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #1916   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           63        63           
  Lines         6610      6610           
  Branches      1067      1067           
=========================================
  Hits          6610      6610           

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