fix(cardano-chain-follower): remove unused dep

Signed-off-by: bkioshn <[email protected]>

Author: bkioshn

rust/cardano-chain-follower/Cargo.toml

@@ -48,7 +48,6 @@ serde = "1.0.217"
 serde_json = "1.0.134"
 mimalloc = { version = "0.1.43", optional = true }
 memx = "0.1.32"
-fmmap = { version = "0.3.3", features = ["sync", "tokio-async"] }
 zstd = "0.13.2"
 logcall = "0.1.11"
 tar = "0.4.43"