Update heck requirement from 0.4 to 0.5

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

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

generator/Cargo.toml

@@ -11,6 +11,6 @@ xml = { package = "xml-rs", version = "0.8" }
 quote = "1.0"
 syn = { version = "2.0", default-features = false, features = ["derive", "printing"] }
 proc-macro2 = "1.0"
-heck = "0.4"
+heck = "0.5"
 indexmap = "2"
 regex = "1.2.1"