Update rustc-hash requirement from 1.1.0 to 2.0.0

Updates the requirements on [rustc-hash](https://github.com/rust-lang/rustc-hash) to permit the latest version.
- [Changelog](https://github.com/rust-lang/rustc-hash/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/rustc-hash/commits)

---
updated-dependencies:
- dependency-name: rustc-hash
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

instant-segment/Cargo.toml

@@ -16,7 +16,7 @@ test-cases = []
 with-serde = ["serde", "smartstring/serde"]
 
 [dependencies]
-rustc-hash = "1.1.0"
+rustc-hash = "2.0.0"
 smartstring = "1"
 serde = { version = "1.0.123", features = ["derive"], optional = true }