⬆ Update fastapi requirement

Updates the requirements on [fastapi](https://github.com/fastapi/fastapi) to permit the latest version.
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.103.2...0.127.0)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-version: 0.127.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements-tests.txt

@@ -7,7 +7,7 @@ mypy ==1.14.1; python_version < "3.9"
 mypy ==1.19.1; python_version >= "3.9"
 ruff ==0.14.10
 # For FastAPI tests
-fastapi >=0.103.2,<0.126.0
+fastapi >=0.103.2,<0.128.0
 httpx ==0.28.1
 dirty-equals ==0.9.0
 jinja2 ==3.1.6