build(deps): bump prettyplease from 0.2.16 to 0.2.19 (#1061)

Bumps [prettyplease](https://github.com/dtolnay/prettyplease) from 0.2.16 to 0.2.19.
- [Release notes](https://github.com/dtolnay/prettyplease/releases)
- [Commits](dtolnay/prettyplease@0.2.16...0.2.19)

---
updated-dependencies:
- dependency-name: prettyplease
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

fiat-constify/Cargo.toml

@@ -15,7 +15,7 @@ readme = "README.md"
 edition = "2021"
 
 [dependencies]
-prettyplease = "0.2.15"
+prettyplease = "0.2.19"
 proc-macro2 = "1"
 quote = "1"
 syn = { version = "2", features = ["extra-traits", "full"] }