fix(people): correct friends list API endpoint for target users (#103)

The `get_friends_by_xuid` method was incorrectly routing to
`/users/me/people/xuids({xuid})/` which only checks the relationship
between the authenticated user and the target, returning empty data (0
friends) if they aren't mutual friends.
This fixes the URL path to `/users/xuid({xuid})/people/friends/` as in
Xbox Android app, correctly utilizing Xbox Live Contract v7 to fetch a
target user's friends list.

Author: misiektoja

src/pythonxbox/api/provider/people/__init__.py

@@ -71,7 +71,10 @@ async def get_friends_by_xuid(
         **kwargs,
     ) -> PeopleResponse:
         """
-        Get friendlist of own profile
+        Get friendlist of a user by their XUID
+
+        Args:
+            xuid: XUID of the user to get friends from
 
         Returns:
             :class:`PeopleResponse`: People Response
@@ -85,7 +88,7 @@ async def get_friends_by_xuid(
             ]
         decoration = self.SEPERATOR.join(decoration_fields)
 
-        url = f"{self.PEOPLE_URL}/users/me/people/xuids({xuid})/decoration/{decoration}"
+        url = f"{self.PEOPLE_URL}/users/xuid({xuid})/people/friends/decoration/{decoration}"
         resp = await self.client.session.get(url, headers=self._headers, **kwargs)
         resp.raise_for_status()
         return PeopleResponse.model_validate_json(resp.text)