Bump dbus-fast from 3.1.2 to 4.0.0 (#6515)

Bumps [dbus-fast](https://github.com/bluetooth-devices/dbus-fast) from 3.1.2 to 4.0.0.
- [Release notes](https://github.com/bluetooth-devices/dbus-fast/releases)
- [Changelog](https://github.com/Bluetooth-Devices/dbus-fast/blob/main/CHANGELOG.md)
- [Commits](https://github.com/bluetooth-devices/dbus-fast/compare/v3.1.2...v4.0.0)

---
updated-dependencies:
- dependency-name: dbus-fast
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -28,5 +28,5 @@ securetar==2025.12.0
 sentry-sdk==2.52.0
 setuptools==82.0.0
 voluptuous==0.16.0
-dbus-fast==3.1.2
+dbus-fast==4.0.0
 zlib-fast==0.2.1