Update smol_str requirement from 0.2.2 to 0.3.1

Updates the requirements on [smol_str](https://github.com/rust-analyzer/smol_str) to permit the latest version.
- [Changelog](https://github.com/rust-analyzer/smol_str/blob/master/CHANGELOG.md)
- [Commits](rust-analyzer/smol_str@v0.2.2...v0.3.1)

---
updated-dependencies:
- dependency-name: smol_str
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

crates/parser/Cargo.toml

@@ -17,7 +17,7 @@ sonatina-triple = { path = "../triple", version = "0.0.3-alpha" }
 cranelift-entity = "0.111"
 pest = "2.7.10"
 pest_derive = "2.7.10"
-smol_str = "0.2.2"
+smol_str = "0.3.1"
 hex = "0.4.3"
 either = { version = "1.12.0", default-features = false }
 annotate-snippets = "0.11.4"