Fix "/" -> "*" typo in query expression evaluation.

Apparently nobody has ever tried to multiply anything inside a butler
query expression, because it wouldn't have worked.

Note that we don't actually need an entry for "/" in this mapping
because that requires special-casing to deal with floating-point vs.
integer division anyway.

python/lsst/daf/butler/registry/queries/expressions/_predicate.py

@@ -200,7 +200,7 @@ def __init__(
         ">=": "__ge__",
         "+": "__add__",
         "-": "__sub__",
-        "/": "__mul__",
+        "*": "__mul__",
     }
 
     def to_datetime(self, time: astropy.time.Time) -> datetime.datetime: