Update heck requirement from 0.3.1 to 0.4.0

Updates the requirements on [heck](https://github.com/withoutboats/heck) to permit the latest version.
- [Release notes](https://github.com/withoutboats/heck/releases)
- [Changelog](https://github.com/withoutboats/heck/blob/master/CHANGELOG.md)
- [Commits](https://github.com/withoutboats/heck/commits)

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

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dependabot[bot] 2021-12-13 06:05:32 +00:00 committed by GitHub
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@ -12,7 +12,7 @@ readme = "../README.md"
edition = "2018"
[dependencies]
heck = "0.3.1"
heck = "0.4.0"
syn = { version = "~1.0", features = ["visit", "extra-traits"] }
proc-macro2 = "~1.0"
quote = "~1.0"