Bump systembridgebackend from 4.2.8 to 4.2.9 (#3189)

Bumps [systembridgebackend](https://github.com/timmo001/system-bridge-backend) from 4.2.8 to 4.2.9.
- [Release notes](https://github.com/timmo001/system-bridge-backend/releases)
- [Commits](timmo001/system-bridge-backend@4.2.8...4.2.9)

---
updated-dependencies:
- dependency-name: systembridgebackend
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements_linux.txt

@@ -1,3 +1,3 @@
-systembridgebackend==4.2.8
+systembridgebackend==4.2.9
 systembridgecli==4.0.6
 systembridgefrontend==4.0.3

requirements_windows.txt

@@ -1,5 +1,5 @@
 pywin32==306
-systembridgebackend==4.2.8
+systembridgebackend==4.2.9
 systembridgecli==4.0.6
 systembridgefrontend==4.0.3
 systembridgewindowssensors==4.0.2