Bump pybreaker from 1.0.1 to 1.4.1 in /reference-apps/fastapi (#8)

Bumps [pybreaker](https://github.com/danielfm/pybreaker) from 1.0.1 to 1.4.1.
- [Release notes](https://github.com/danielfm/pybreaker/releases)
- [Changelog](https://github.com/danielfm/pybreaker/blob/main/CHANGELOG)
- [Commits](danielfm/pybreaker@1.0.1...v1.4.1)

---
updated-dependencies:
- dependency-name: pybreaker
  dependency-version: 1.4.1
  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

@@ -2,7 +2,7 @@ fastapi==0.121.1
 uvicorn[standard]==0.38.0
 pydantic-settings==2.12.0
 slowapi==0.1.9  # Rate limiting
-pybreaker==1.0.1  # Circuit breaker
+pybreaker==1.4.1  # Circuit breaker
 
 # HTTP client
 httpx==0.28.1