chore: fix keywords length

Signed-off-by: Gaius <gaius.qi@gmail.com>

Author: gaius-qi

Cargo.toml

@@ -5,7 +5,7 @@ description = "A P2P file transfer protocol"
 authors = ["The Dragonfly Developers"]
 homepage = "https://d7y.io/"
 repository = "https://github.com/dragonflyoss/vortex.git"
-keywords = ["dragonfly", "p2p", "file transfer protocol"]
+keywords = ["dragonfly", "p2p", "transfer protocol"]
 license = "Apache-2.0"
 readme = "README.md"
 edition = "2021"