upgrade rust edition to 2021

Author: Pana

cargo-ledger/Cargo.toml

@@ -7,7 +7,7 @@ categories = ["development-tools::cargo-plugins"]
 repository = "https://github.com/LedgerHQ/cargo-ledger"
 readme = "README.md"
 license = "Apache-2.0"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 cargo_metadata = "0.11.0"

testmacro/Cargo.toml

@@ -2,7 +2,7 @@
 name = "testmacro"
 version = "0.1.0"
 authors = ["yhql <[email protected]>"]
-edition = "2018"
+edition = "2021"
 license.workspace = true
 repository.workspace = true
 description = "procedural macro used to run unit and integration tests"