build(deps): bump starlette from 1.0.1 to 1.2.1

Bumps [starlette](https://github.com/Kludex/starlette) from 1.0.1 to 1.2.1.
- [Release notes](https://github.com/Kludex/starlette/releases)
- [Changelog](https://github.com/Kludex/starlette/blob/main/docs/release-notes.md)
- [Commits](Kludex/starlette@1.0.1...1.2.1)

---
updated-dependencies:
- dependency-name: starlette
  dependency-version: 1.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -12,7 +12,7 @@ dependencies = [
     # Pin starlette >=0.49.1 to fix CVE-2025-62727 (Range header DoS in
     # FileResponse).  FastAPI <0.120 caps starlette below 0.49, so we also
     # bump the FastAPI floor to 0.120.
-    "starlette>=1.0.0,<1.1",
+    "starlette>=1.0.0,<1.3",
     "uvicorn[standard]>=0.30,<0.48",
     "pydantic>=2.7,<3",
     "typer>=0.12,<0.27",