third-party/rust: Bump bytes 1.1 -> 1.6.0

Summary:
As it says on the tin. There have been many new features added since the old version. [Staring at the changelog](https://github.com/tokio-rs/bytes/blob/master/CHANGELOG.md), I don't believe they added breaking changes.

Changes to other libraries:
- *common/rust/folly/iobuf* - the panic message changed so I changed the should_panic rule to match

Reviewed By: diliop

Differential Revision: D55807882

fbshipit-source-id: 8d70a8bae57509fdca82ab18770275111a1f1902

below/store/Cargo.toml

@@ -12,7 +12,7 @@ license = "Apache-2.0"
 [dependencies]
 anyhow = "1.0.75"
 bitflags = { version = "2.4", features = ["serde"] }
-bytes = { version = "1.1", features = ["serde"] }
+bytes = { version = "1.6.0", features = ["serde"] }
 common = { package = "below-common", version = "0.8.1", path = "../common" }
 humantime = "2.1"
 maplit = "1.0"