Update unicode-width requirement from =0.1.12 to =0.2.0

Updates the requirements on [unicode-width](https://github.com/unicode-rs/unicode-width) to permit the latest version.
- [Commits](https://github.com/unicode-rs/unicode-width/commits)

---
updated-dependencies:
- dependency-name: unicode-width
  dependency-type: direct:production
...

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

data-url/Cargo.toml

@@ -18,7 +18,7 @@ alloc = []
 [dev-dependencies]
 tester = "0.9"
 # We pin this transitive dev dep so that MSRV CI can continue to run.
-unicode-width = "=0.1.12"
+unicode-width = "=0.2.0"
 serde = { version = "1.0", default-features = false, features = ["alloc", "derive"] }
 serde_json = "1.0"