fixed py 3.14 compatibility by adding a new function

Signed-off-by: AvinashYerra <101195675+AvinashYerra@users.noreply.github.com>

Author: AvinashYerra

sqlmesh/magics.py

@@ -98,7 +98,7 @@ def wrapper(self: SQLMeshMagics, *args: t.Any, **kwargs: t.Any) -> None:
 def parse_expand(value: str) -> t.Union[bool, t.List[str]]:
     if value.lower() = "true":
         return True
-    if value.lower() in "false":
+    if value.lower() = "false":
         return False
     return [name.strip() for name in value.split(",") if name.strip()]