try to fix sqyalchemy-error wieh deleting a forkrankmember

fieldpoc/routing.py

@@ -278,7 +278,7 @@ class YwsdForkRankMemberModel(ForkRankMemberModel):
             conn.execute(
                 ForkRank.member_table.update()
                 .where(
-                    _and(
+                    sqlalchemy.and_(
                         ForkRank.member_table.c.forkrank_id
                         == self.diffsync.get("forkrank", self.forkrank).forkrank_id,
                         ForkRank.member_table.c.extension_id
@@ -293,7 +293,7 @@ class YwsdForkRankMemberModel(ForkRankMemberModel):
         with self.diffsync.engine.connect() as conn:
             conn.execute(
                 ForkRank.member_table.delete().where(
-                    _and(
+                    sqlalchemy.and_(
                         ForkRank.member_table.c.forkrank_id
                         == self.diffsync.get("forkrank", self.forkrank).forkrank_id,
                         ForkRank.member_table.c.extension_id