Remove rustc_lexer dependency in favour of rustc-ap-rustc_lexer

The latter is auto-published on a regular schedule (Right now weekly).

Author: est31

Cargo.lock

@@ -13,7 +13,7 @@ doctest = false
 [dependencies]
 itertools = "0.9.0"
 rowan = "0.9.1"
-rustc_lexer = "0.1.0"
+rustc_lexer = { version = "652.0.0", package = "rustc-ap-rustc_lexer" }
 rustc-hash = "1.1.0"
 arrayvec = "0.5.1"
 once_cell = "1.3.1"