add version as ldflag

[umbynos]

currently during the release we have to manually set the version in

arduino-language-server/ls/ls.go

Line 359 in 6aec1ed

Version: "0.7.2",

This can be enhanced like we do in the Arduino CLI: https://github.com/arduino/arduino-cli/blob/master/Taskfile.yml#L351

[MatteoPologruto]

Done here: #139