fixed pylint issues

Signed-off-by: Veeresh K <[email protected]>

Author: nmveeresh

mcpgateway/alembic/versions/878e287d2366_resize_url_and_slug_columns_to_191.py

@@ -9,7 +9,6 @@
 
 from alembic import op
 import sqlalchemy as sa
-from sqlalchemy.dialects import mysql
 
 # revision identifiers, used by Alembic.
 revision: str = '878e287d2366'
@@ -60,4 +59,4 @@ def downgrade() -> None:
         existing_type=sa.String(length=191),
         type_=sa.String(length=767),
         existing_nullable=False
-    )
+    )