chore(deps): bump httpx from 0.27.2 to 0.28.1

Bumps [httpx](https://github.com/encode/httpx) from 0.27.2 to 0.28.1.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.27.2...0.28.1)

---
updated-dependencies:
- dependency-name: httpx
  dependency-version: 0.28.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

poetry.lock

@@ -18,7 +18,7 @@ structlog = "^24.4.0"
 sentry-sdk = {extras = ["fastapi"], version = "^2.14.0"}
 slowapi = "^0.1.9"
 prometheus-client = ">=0.21,<0.26"
-httpx = "^0.27.2"
+httpx = ">=0.27.2,<0.29.0"
 python-multipart = ">=0.0.12,<0.0.33"
 pdfplumber = "^0.11.4"
 python-docx = "^1.1.2"