Fix fleet tests for Instance.finished_at field

Add finished_at to expected Instance dicts in fleet API tests.

Made-with: Cursor

Author: peterschmidt85

src/tests/_internal/server/routers/test_fleets.py

@@ -411,6 +411,7 @@ async def test_creates_fleet(self, test_db, session: AsyncSession, client: Async
                     "termination_reason": None,
                     "termination_reason_message": None,
                     "created": "2023-01-02T03:04:00+00:00",
+                    "finished_at": None,
                     "backend": None,
                     "region": None,
                     "availability_zone": None,
@@ -554,6 +555,7 @@ async def test_creates_ssh_fleet(self, test_db, session: AsyncSession, client: A
                     "termination_reason": None,
                     "termination_reason_message": None,
                     "created": "2023-01-02T03:04:00+00:00",
+                    "finished_at": None,
                     "region": "remote",
                     "availability_zone": None,
                     "price": 0.0,
@@ -733,6 +735,7 @@ async def test_updates_ssh_fleet(self, test_db, session: AsyncSession, client: A
                     "termination_reason": "terminated_by_user",
                     "termination_reason_message": None,
                     "created": "2023-01-02T03:04:00+00:00",
+                    "finished_at": None,
                     "region": "remote",
                     "availability_zone": None,
                     "price": 0.0,
@@ -767,6 +770,7 @@ async def test_updates_ssh_fleet(self, test_db, session: AsyncSession, client: A
                     "termination_reason": None,
                     "termination_reason_message": None,
                     "created": "2023-01-02T03:04:00+00:00",
+                    "finished_at": None,
                     "region": "remote",
                     "availability_zone": None,
                     "price": 0.0,