chore: remove explicit sparse protocol setting (#6633)

Author: LesnyRumcajs

.cargo/config.toml

@@ -17,9 +17,6 @@ rustflags = ["--cfg=tokio_unstable"]
 git-fetch-with-cli = true
 retry = 5
 
-[registries.crates-io]
-protocol = "sparse"
-
 [env]
 # Disable exponential formatting in `bigdecimal`
 # as a workaround for https://github.com/ChainSafe/forest/issues/4035