fix style edition to 2021

running rustfmt with edition 2024 creates a lot of noise

Signed-off-by: Simon Davies <[email protected]>

Author: simongdavies

rustfmt.toml

@@ -3,4 +3,5 @@ unstable_features = true # Cargo fmt now needs to be called with `cargo +nightly
 group_imports = "StdExternalCrate" # create three groups for std, external and local crates
 # Merge imports from the same module
 # See: https://rust-lang.github.io/rustfmt/?version=v1.4.38&search=#imports_granularity
-imports_granularity = "Module"
+imports_granularity = "Module"
+style_edition = "2021"