chore(deps): bump uvicorn[standard] (#442)

Bumps [uvicorn[standard]](https://github.com/encode/uvicorn) from 0.18.2 to 0.18.3.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/CHANGELOG.md)
- [Commits](encode/uvicorn@0.18.2...0.18.3)

---
updated-dependencies:
- dependency-name: uvicorn[standard]
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

test-engineering/contract-tests/partner/requirements.txt

@@ -34,7 +34,7 @@ starlette==0.19.1
     # via fastapi
 typing-extensions==4.3.0
     # via pydantic
-uvicorn[standard]==0.18.2
+uvicorn[standard]==0.18.3
     # via -r requirements.in
 uvloop==0.16.0
     # via uvicorn