deployer: send emails using the committer address, not the author's

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

deploy/management/commands/deploy.py

@@ -112,7 +112,7 @@ class Command(BaseCommand):
         deployer = Deployer(dry_run=options["dry_run"])
         try:
             deployer.select_branch()
-            email_handler.fromaddr = deployer.ref.commit.author.email
+            email_handler.fromaddr = deployer.ref.commit.committer.email
             log.debug("Email from: %s", email_handler.fromaddr)
             log.debug("Email to: %r", email_handler.toaddrs)
             log.debug("Email subject: %s", email_handler.subject)