port Miri to edition 2021

RalfJung · RalfJung · commit af3f683ba64c · 2022-04-09T11:16:50.000-04:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -6,7 +6,7 @@ name = "miri"
 repository = "https://github.com/rust-lang/miri"
 version = "0.1.0"
 default-run = "miri"
-edition = "2018"
+edition = "2021"
 
 [lib]
 test = true # we have unit tests
