Bump pytest-asyncio from 1.2.0 to 1.3.0 in /reference-apps/fastapi (#6)

Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) from 1.2.0 to 1.3.0.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v1.2.0...v1.3.0)

---
updated-dependencies:
- dependency-name: pytest-asyncio
  dependency-version: 1.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

reference-apps/fastapi/requirements.txt

@@ -29,7 +29,7 @@ prometheus-client==0.23.1
 
 # Testing
 pytest==8.3.4  # pytest-asyncio 1.2.0 requires pytest<9
-pytest-asyncio==1.2.0
+pytest-asyncio==1.3.0
 pytest-cov==7.0.0
 pytest-mock==3.15.1
 httpx==0.28.1  # Already listed above but needed for testing