Update proptest-derive requirement from 0.3 to 0.4 (#7)

Updates the requirements on [proptest-derive](https://github.com/proptest-rs/proptest) to permit the latest version.
- [Release notes](https://github.com/proptest-rs/proptest/releases)
- [Changelog](https://github.com/proptest-rs/proptest/blob/0.4.0/CHANGELOG.md)
- [Commits](proptest-rs/proptest@proptest-derive-0.3.0...0.4.0)

---
updated-dependencies:
- dependency-name: proptest-derive
  dependency-type: direct:production
...

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

Cargo.toml

@@ -17,12 +17,12 @@ base64 = "0.21"
 base64-serde = "0.7"
 bytes = "1"
 proptest = { version = "1.0", optional = true }
-proptest-derive = { version = "0.3", optional = true }
+proptest-derive = { version = "0.4", optional = true }
 serde = "1"
 
 [dev-dependencies]
 proptest = "1.0"
-proptest-derive = "0.3"
+proptest-derive = "0.4"
 serde_json = "1"
 
 [features]