deps: update python-multipart requirement from >=0.0.27 to >=0.0.28 (#43)

Updates the requirements on [python-multipart](https://github.com/Kludex/python-multipart) to permit the latest version.
- [Release notes](https://github.com/Kludex/python-multipart/releases)
- [Changelog](https://github.com/Kludex/python-multipart/blob/main/CHANGELOG.md)
- [Commits](Kludex/python-multipart@0.0.27...0.0.28)

---
updated-dependencies:
- dependency-name: python-multipart
  dependency-version: 0.0.28
  dependency-type: direct:production
...

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Author: dependabot[bot]

requirements.txt

@@ -7,7 +7,7 @@ pyyaml>=6.0.3
 aiosqlite>=0.22.1
 httpx>=0.28.1
 apscheduler>=3.11.2
-python-multipart>=0.0.27
+python-multipart>=0.0.28
 cryptography>=47.0.0
 bcrypt>=5.0.0
 itsdangerous>=2.2