Git-ignore the `arduino-cli.exe` on Windows. (#891)

When I build the CLI on Windows, I do not want to see the executable as
an outgoing Git change. Same as on POSIX.
Signed-off-by: Akos Kitta <kittaakos@typefox.io>

.gitignore

 /debug
-/arduino-cli
+/arduino-cli*
 /main
 /.vscode/
 /cmd/formatter/debug.test