Update redis package and use pickle for serialize data
The new redis version is more strict about the kind of object to store, we cannot use the same way that with the version 2.X. In redis we want to store the SearchData class. Instead of store field one by one we store the full serialized object with pickle. Pickle is not very secure but we dont care for now because the redis storage will be deploy in the same host that spot service. In a second time we can use another way to serialize SearchData with msgpack and mashumaro for example.
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