refactor: remove unnecesary deps that are blended in when rebase

Author: shogo-nakano-desu

Cargo.toml

@@ -105,10 +105,3 @@ triomphe = { version = "0.1.8", default-features = false, features = ["std"] }
 hashbrown = { version = "0.12.3", features = [
   "inline-more",
 ], default-features = false }
-
-rustc_lexer = { version = "0.10.0", package = "ra-ap-rustc_lexer" }
-rustc_parse_format = { version = "0.10.0", package = "ra-ap-rustc_parse_format", default-features = false }
-
-# Upstream broke this for us so we can't update it
-rustc_abi = { version = "0.0.20221221", package = "hkalbasi-rustc-ap-rustc_abi", default-features = false }
-rustc_index = { version = "0.0.20221221", package = "hkalbasi-rustc-ap-rustc_index", default-features = false }