refactor: Move curl installation from IrohDeployer to ChatmailDeployer

- The 'curl' program is used in TurnDeployer and IrohDeployer, so it
  makes more sense to install it at the beginning in ChatmailDeployer,
  rather than have each thing that uses it install it separately.

cmdeploy/src/cmdeploy/__init__.py

@@ -906,11 +906,6 @@ class IrohDeployer(Deployer):
             ),
         }[host.get_fact(facts.server.Arch)]
 
-        apt.packages(
-            name="Install curl",
-            packages=["curl"],
-        )
-
         existing_sha256sum = host.get_fact(Sha256File, "/usr/local/bin/iroh-relay")
         if existing_sha256sum != sha256sum:
             server.shell(
@@ -1063,6 +1058,11 @@ class ChatmailDeployer(Deployer):
         apt.update(name="apt update", cache_time=24 * 3600)
         apt.upgrade(name="upgrade apt packages", auto_remove=True)
 
+        apt.packages(
+            name="Install curl",
+            packages=["curl"],
+        )
+
         apt.packages(
             name="Install rsync",
             packages=["rsync"],