remove bump in generational box

packages/generational-box/Cargo.toml

@@ -10,7 +10,6 @@ keywords = ["generational", "box", "memory", "allocator"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-bumpalo = { version = "3.6" }
 
 [dev-dependencies]
 rand = "0.8.5"