Add asyncsafe and threadsafe injection tests

[remimd]

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[Copilot]

Pull request overview

This pull request adds comprehensive tests for async-safe and thread-safe dependency injection scenarios, updates two Python package dependencies, and extends CI testing coverage to include Python 3.14t (free-threaded build).

• Adds test for async singleton injection with concurrent task execution using anyio
• Adds test for thread-safe injection with concurrent thread execution using ThreadPoolExecutor
• Updates dependency versions (uv 0.9.22 → 0.9.23, virtualenv 20.36.0 → 20.36.1)

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/test_inject.py	Adds two new test cases: one for async singleton behavior with concurrent async tasks, and one for threadsafe injection with concurrent threads
uv.lock	Updates uv package from 0.9.22 to 0.9.23 and virtualenv from 20.36.0 to 20.36.1 with corresponding wheel distributions
.github/workflows/ci.yml	Adds Python 3.14t (free-threaded build) to the CI test matrix

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