Update to Node20

[phoeniixhawk]

GitHub is now deprecating Node 16, update this to hide warnings. Tested successfully with these parameters:
connection_url:
subject:
to:
from:
reply_to:
cc:
body:
html_body:
convert_markdown: true
secure: true
priority: normal

[dawidd6]

Thanks

[maor-lb]

Hi @dawidd6 when do you plan to release new version working on Node 20 ?

[dawidd6]

Released now