fix(greeter): reconnect to DDM on service changes - #1154

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-go@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Include file: <QScopeGuard> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QLocalSocket> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QGuiApplication> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QDBusServiceWatcher> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QDBusReply> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QDBusPendingCall> not found. Please note: Cppcheck does not need standard library headers to get proper results.