upgrade protobuf to 6.33.5 (fix security problem)

Cause: protobuf affected by a JSON recursion depth bypass:

A denial-of-service (DoS) vulnerability exists in google.protobuf.json_format.ParseDict() in Python, where the max_recursion_depth limit can be bypassed when parsing nested google.protobuf.Any messages.

Due to missing recursion depth accounting inside the internal Any-handling logic, an attacker can supply deeply nested Any structures that bypass the intended recursion limit, eventually exhausting Python’s recursion stack and causing a RecursionError.

excludes.txt

@@ -0,0 +1 @@
+opencv-python