chore: hint machine addresses as list of dicts

Having `list[str]` has type-hinting made working with a type-checker
awkward as an addresses is defined as a dict of mostly [str, str]
key-values pairs, with one key-value being a [str, boolean] key-value
pairs.

Signed-off-by: Guillaume Boutry <guillaume.boutry@canonical.com>

Author: gboutry

juju/machine.py

@@ -227,7 +227,7 @@ async def ssh(
         return stdout.decode()
 
     @property
-    def addresses(self) -> typing.List[str]:
+    def addresses(self) -> typing.List[dict]:
         """Returns the machine addresses."""
         return self.safe_data["addresses"] or []