Bump dbus-fast from 2.45.1 to 3.1.2 (#6317)

* Bump dbus-fast from 2.45.1 to 3.1.2

Bumps [dbus-fast](https://github.com/bluetooth-devices/dbus-fast) from 2.45.1 to 3.1.2.
- [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/v2.45.1...v3.1.2)

---
updated-dependencies:
- dependency-name: dbus-fast
  dependency-version: 3.1.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

* Update unit tests for dbus-fast 3.1.2 changes

* Fix type annotations

---------

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

requirements.txt

@@ -28,5 +28,5 @@ securetar==2025.2.1
 sentry-sdk==2.46.0
 setuptools==80.9.0
 voluptuous==0.15.2
-dbus-fast==2.45.1
+dbus-fast==3.1.2
 zlib-fast==0.2.1