chore(go.mod): fix module path

[ryanschneider]

📝 Summary

I wanted to the the proxy/types.go as we discussed, but run into this error:

# go get github.com/flashbots/tdx-orderflow-proxy/proxy@latest
go: github.com/flashbots/tdx-orderflow-proxy@v0.1.0 (matching github.com/flashbots/tdx-orderflow-proxy/proxy@latest) requires github.com/flashbots/tdx-orderflow-proxy@v0.1.0: parsing go.mod:
	module declares its path as: github.com/flashbots/orderflow-proxy
	        but was required as: github.com/flashbots/tdx-orderflow-proxy

I'll work around it for now by checking out locally and using a replace directive.

⛱ Motivation and Context

Optionally we could just rename the GH repo instead, I'm open to either.

📚 References

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✅ I have run these commands

• make lint
• make test
• go mod tidy