Bump rustc_lexer a little

Author: lnicola

Cargo.lock

@@ -13,7 +13,7 @@ doctest = false
 cov-mark = "2.0.0-pre.1"
 itertools = "0.10.0"
 rowan = "=0.13.0-pre.7"
-rustc_lexer = { version = "721.0.0", package = "rustc-ap-rustc_lexer" }
+rustc_lexer = { version = "725.0.0", package = "rustc-ap-rustc_lexer" }
 rustc-hash = "1.1.0"
 arrayvec = "0.7"
 once_cell = "1.3.1"