fix: remove unnecessary gzip header to prevent RPC deserialization failures #260
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Summary
This PR removes the manually-added HTTP header:
headers={"content-encoding": "gzip"}
from the DriftPy RPC request layer.
This header was incorrectly instructing Solana RPC nodes that the incoming request body was gzip-encoded, even though our client was sending plain JSON.
This caused many providers (especially Helius, Triton, and even api.mainnet-beta) to reject or mis-parse the request.