fix: Mypy

Author: Stranger6667

src/hypothesis_jsonschema/_canonicalise.py

@@ -82,7 +82,9 @@ def __init__(self, schema: Schema) -> None:
         self.schema = schema
         self.encoded = hash(json.dumps(schema, sort_keys=True))
 
-    def __eq__(self, other: "CacheableSchema") -> bool:
+    def __eq__(self, other: object) -> bool:
+        if not isinstance(other, CacheableSchema):
+            return NotImplemented
         return self.encoded == other.encoded
 
     def __hash__(self) -> int: