Remove compiler-builtins from rustc-dep-of-std dependencies

Since [1], this will come automatically from `rustc-std-workspace-core`
and the crates.io dependency should no longer be specified.

[1]: rust-lang/rust#141993

Author: tgross35

Cargo.lock

@@ -12,8 +12,7 @@ categories = ["os"]
 [dependencies]
 core = { version = "1.0.0", optional = true, package = "rustc-std-workspace-core" }
 alloc = { version = "1.0.0", optional = true, package = "rustc-std-workspace-alloc" }
-compiler_builtins = { version = "0.1", optional = true }
 
 [features]
 default = []
-rustc-dep-of-std = ["core", "alloc", "compiler_builtins/rustc-dep-of-std"]
+rustc-dep-of-std = ["core", "alloc"]