Update to NDC Spec v0.2.0-rc.3 (#41)

Updates to the latest NDC Spec v0.2.0-rc.3 version.

Also updates transitive cargo deps to address cargo audit warnings.

Author: daniel-chambers

CHANGELOG.md

@@ -6,7 +6,7 @@ This changelog documents the changes between release versions.
 
 Changes to be included in the next upcoming release
 
-**Breaking changes** ([#38](https://github.com/hasura/ndc-sdk-rs/pull/38)):
+**Breaking changes** ([#38](https://github.com/hasura/ndc-sdk-rs/pull/38), [#40](https://github.com/hasura/ndc-sdk-rs/pull/40), [#41](https://github.com/hasura/ndc-sdk-rs/pull/41)):
 
 - Updated to support [v0.2.0 of the NDC Spec](https://hasura.github.io/ndc-spec/specification/changelog.html#020). This is a very large update which adds new features and some breaking changes.
 - If the [`X-Hasura-NDC-Version`](https://hasura.github.io/ndc-spec/specification/versioning.html) header is sent, the SDK will validate that the connector supports the incoming request's version and reject it if it does not. If no header is sent, no action is taken.