Replace deprecated Send-MailMessage with Send-MailKitMessage (#107)

The Send-MailMessage cmdlet is obsolete. It doesn't guarantee secure connections to SMTP servers.

Use Send-MailKitMessage module instead.

Signed-off-by: Manuel Fombuena <fombuena@outlook.com>
Co-authored-by: Kevin Woley <kmwoley@users.noreply.github.com>

install.ps1

@@ -60,4 +60,5 @@ else {
     Write-Warning "[[Scheduler]] Backup task not scheduled: there is already a task with the name '$backup_task_name'."
 }
 
-
+# Install Send-MailKitMessage module
+Install-Module Send-MailKitMessage -Repository PSGallery -Scope AllUsers