mypy: Support mypy 1.15.0

Change-Id: I46ad60a060a3310a3d2a762fc99bec701249b7d9

cinder/backup/manager.py

@@ -439,6 +439,7 @@ class BackupManager(manager.SchedulerDependentManager):
         except Exception as err:
             with excutils.save_and_reraise_exception():
                 if snapshot_id:
+                    assert snapshot is not None
                     snapshot.status = fields.SnapshotStatus.AVAILABLE
                     snapshot.save()
                 else:

cinder/volume/volume_utils.py

@@ -1312,7 +1312,7 @@ def resolve_hostname(hostname: str) -> str:
     ip = socket.getaddrinfo(hostname, None)[0][4][0]
     LOG.debug('Asked to resolve hostname %(host)s and got IP %(ip)s.',
               {'host': hostname, 'ip': ip})
-    return ip
+    return str(ip)
 
 
 def update_backup_error(backup,

test-requirements.txt

@@ -18,6 +18,6 @@ SQLAlchemy-Utils>=0.37.8 # BSD License
 testtools>=2.4.0 # MIT
 
 doc8>=0.8.1 # Apache-2.0
-mypy>=1.7.0,<1.14.0 # MIT
+mypy>=1.7.0,<1.16.0 # MIT
 moto>=5.0.0 # Apache-2.0
 distro>=1.8.0 # Apache-2.0