⬆ Bump python-multipart from 0.0.10 to 0.0.20 in /backend (#1595)

Bumps [python-multipart](https://github.com/Kludex/python-multipart) from 0.0.10 to 0.0.20.
- [Release notes](https://github.com/Kludex/python-multipart/releases)
- [Changelog](https://github.com/Kludex/python-multipart/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Kludex/python-multipart/compare/0.0.10...0.0.20)

---
updated-dependencies:
- dependency-name: python-multipart
  dependency-version: 0.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

backend/uv.lock

@@ -1084,11 +1084,11 @@ wheels = [
 
 [[package]]
 name = "python-multipart"
-version = "0.0.10"
+version = "0.0.20"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/f9/29/0e5c896ec896b4e501bafa80ab555bbf3bcb0d720e9e33f908179aeb1a61/python_multipart-0.0.10.tar.gz", hash = "sha256:46eb3c6ce6fdda5fb1a03c7e11d490e407c6930a2703fe7aef4da71c374688fa", size = 34619 }
+sdist = { url = "https://files.pythonhosted.org/packages/f3/87/f44d7c9f274c7ee665a29b885ec97089ec5dc034c7f3fafa03da9e39a09e/python_multipart-0.0.20.tar.gz", hash = "sha256:8dd0cab45b8e23064ae09147625994d090fa46f5b0d1e13af944c331a7fa9d13", size = 37158 }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/b8/d7/1d8acecc4621aa2b70fca28c1a651e02d936152e77d6be07d00601b31cf3/python_multipart-0.0.10-py3-none-any.whl", hash = "sha256:2b06ad9e8d50c7a8db80e3b56dab590137b323410605af2be20d62a5f1ba1dc8", size = 22680 },
+    { url = "https://files.pythonhosted.org/packages/45/58/38b5afbc1a800eeea951b9285d3912613f2603bdf897a4ab0f4bd7f405fc/python_multipart-0.0.20-py3-none-any.whl", hash = "sha256:8a62d3a8335e06589fe01f2a3e178cdcc632f3fbe0d492ad9ee0ec35aab1f104", size = 24546 },
 ]
 
 [[package]]