v1.9.3

Fixes

• Fix error running exec subcommand of tiup-cluster when hostname contains '-' (#1794, @nexustar)
• Fix port conflict check for TiFlash instances in tiup-cluster (#1805, @AstroProfundis)
• Fix next-generation monitor (ng-monitor) not available in Prometheus (#1806, @nexustar)
• Fix node_exporter metrics not collected if the host has only Prometheus deployed (#1806, @nexustar)
• Fix --host 0.0.0.0 not working in tiup-playground (#1811, @nexustar)

Improvements

• Support cleanup audit log files for tiup-cluster and tiup-dm (#1780, @srstack)
• Add anonymous login example to Grafana configuration templates (#1785@sunzhaoyang)