chore: prep v1.9.0 release

Cargo.lock

diff --git a/Cargo.lock b/Cargo.lock
index dbc6228..64b4aae 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -519,7 +519,7 @@
 
 [[package]]
 name = "rustfmt-nightly"
-version = "1.8.0"
+version = "1.9.0"
 dependencies = [
  "annotate-snippets",
  "anyhow",

Cargo.toml

diff --git a/Cargo.toml b/Cargo.toml
index 65ece1e..6ac140f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 
 name = "rustfmt-nightly"
-version = "1.8.0"
+version = "1.9.0"
 description = "Tool to find and fix Rust formatting issues"
 repository = "https://github.com/rust-lang/rustfmt"
 readme = "README.md"