dbus: 1.12.6 -> 1.12.8

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/dbus/versions.

These checks were done:

- built on NixOS
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-monitor --help’ got 0 exit code
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-update-activation-environment help’ got 0 exit code
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-cleanup-sockets -h’ got 0 exit code
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-cleanup-sockets --help’ got 0 exit code
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-cleanup-sockets help’ got 0 exit code
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-run-session -h’ got 0 exit code
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-run-session --help’ got 0 exit code
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-uuidgen --help’ got 0 exit code
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-launch -h’ got 0 exit code
- ran ‘/nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8/bin/dbus-launch --help’ got 0 exit code
- found 1.12.8 with grep in /nix/store/q2p724wzbngs5qrv96s2mny5bhsnm3jk-dbus-1.12.8
- directory tree listing: https://gist.github.com/598fa486a7a2da2a0887e0899dd2ed27