Bump schemars from 0.8.20 to 0.8.21 (#1952)

Bumps [schemars](https://github.com/GREsau/schemars) from 0.8.20 to 0.8.21.
- [Release notes](https://github.com/GREsau/schemars/releases)
- [Changelog](https://github.com/GREsau/schemars/blob/master/CHANGELOG.md)
- [Commits](GREsau/schemars@v0.8.20...v0.8.21)

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

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

Cargo.toml

@@ -178,7 +178,7 @@ proptest-derive = "0.3.0"
 rayon = "1.5.2"
 rand = "0.8.5"
 rand_core = { version = "0.6.3", default-features = false }
-schemars = { version = "0.8.10", features = ["either"] }
+schemars = { version = "0.8.21", features = ["either"] }
 serde = { version = "1.0.203", features = ["derive", "rc"] }
 serde_bytes = "0.11.6"
 #serde_json = { version = "1.0.111", features = ["preserve_order", "arbitrary_precision"] }