Update xxtea requirement from ==3.2.* to ==3.3.* in /app (#1322)

Updates the requirements on [xxtea](https://github.com/ifduyue/xxtea) to permit the latest version.
- [Release notes](https://github.com/ifduyue/xxtea/releases)
- [Changelog](https://github.com/ifduyue/xxtea/blob/master/CHANGELOG.rst)
- [Commits](ifduyue/xxtea@v3.2.0...v3.3.0)

---
updated-dependencies:
- dependency-name: xxtea
  dependency-type: direct:production
...

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

app/requirements.txt

@@ -5,4 +5,4 @@ pydantic==2.8.*
 python-dotenv==1.0.*
 requests==2.32.*
 PyYAML==6.0.*
-xxtea==3.2.*
+xxtea==3.3.*