Fix linter failures (#19116)

Author: evelyn-ys

src/azure-cli/azure/cli/command_modules/network/custom.py

@@ -2657,7 +2657,7 @@ def _validate_ipv6_address_prefixes(prefixes):
             if version is None:
                 version = type(network)
             else:
-                if not isinstance(network, version):
+                if not isinstance(network, version):  # pylint: disable=isinstance-second-argument-not-valid-type
                     raise CLIError("usage error: '{}' incompatible mix of IPv4 and IPv6 address prefixes."
                                    .format(prefixes))
         except ValueError:

src/azure-cli/azure/cli/command_modules/sql/custom.py

@@ -450,7 +450,7 @@ def _get_identity_object_from_type(
                     if umiDict is None:
                         umiDict = {identity: UserIdentity()}
                     else:
-                        umiDict[identity] = UserIdentity()
+                        umiDict[identity] = UserIdentity()  # pylint: disable=unsupported-assignment-operation
 
                 identityResult = ResourceIdentity(type=ResourceIdType.system_assigned_user_assigned.value,
                                                   user_assigned_identities=umiDict)
@@ -470,7 +470,7 @@ def _get_identity_object_from_type(
                     if umiDict is None:
                         umiDict = {identity: UserIdentity()}
                     else:
-                        umiDict[identity] = UserIdentity()
+                        umiDict[identity] = UserIdentity()  # pylint: disable=unsupported-assignment-operation
 
                 identityResult = ResourceIdentity(type=ResourceIdType.user_assigned.value,
                                                   user_assigned_identities=umiDict)