chore: bump version to 0.16.15-dev

Author: sshdb-release-bot

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sshdb"
-version = "0.16.15"
+version = "0.16.15-dev"
 edition = "2021"
 description = "Keyboard-first SSH library and launcher TUI."
 authors = ["Riccardo Iaconelli <riccardo@kde.org>"]