Update jsonschema requirement from 0.20 to 0.21

Updates the requirements on [jsonschema](https://github.com/Stranger6667/jsonschema-rs) to permit the latest version.
- [Release notes](https://github.com/Stranger6667/jsonschema-rs/releases)
- [Changelog](https://github.com/Stranger6667/jsonschema-rs/blob/master/CHANGELOG.md)
- [Commits](Stranger6667/jsonschema-rs@rust-v0.20.0...rust-v0.21.0)

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

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

crates/samples/components/json_validator/Cargo.toml

@@ -8,7 +8,7 @@ publish = false
 crate-type = ["cdylib"]
 
 [dependencies]
-jsonschema = { version = "0.20", default-features = false }
+jsonschema = { version = "0.21", default-features = false }
 serde_json = {version = "1.0", default-features = false }
 
 [dependencies.windows]

crates/samples/components/json_validator_winrt/Cargo.toml

@@ -9,7 +9,7 @@ name = "sample"
 crate-type = ["cdylib"]
 
 [dependencies]
-jsonschema = { version = "0.20", default-features = false }
+jsonschema = { version = "0.21", default-features = false }
 serde_json = {version = "1.0", default-features = false }
 
 [dependencies.windows]