update "bytes" crate: 1.6.0 -> 1.9.0

Summary:
# Why

[bytes 1.6.0](https://docs.rs/bytes/1.6.0/bytes/index.html) has been yanked, time to update  to the latest version

 {F1974418313}

# What changes

[CHANGELOG](https://github.com/tokio-rs/bytes/blob/master/CHANGELOG.md) doesn't suggest any breaking changes, the failed build will tell us if there are any.

Reviewed By: edward-shen

Differential Revision: D68330007

fbshipit-source-id: 08ebc709a60d5ae150e592397dc233dccb477957

below/store/Cargo.toml

@@ -12,7 +12,7 @@ license = "Apache-2.0"
 [dependencies]
 anyhow = "1.0.95"
 bitflags = { version = "2.6", features = ["serde"] }
-bytes = { version = "1.6.0", features = ["serde"] }
+bytes = { version = "1.9.0", features = ["serde"] }
 common = { package = "below-common", version = "0.8.1", path = "../common" }
 humantime = "2.1"
 maplit = "1.0"