[site] add link to tag in changelog

Author: sunshowers

site/src/CHANGELOG.md

@@ -38,6 +38,7 @@ Supported in this initial release:
 * [Test retries](book/retries.md) and flaky test detection
 * [JUnit support](book/junit.md) for integration with other test tooling
 
+[0.9.3]: https://github.com/nextest-rs/nextest/releases/tag/cargo-nextest-0.9.3
 [0.9.2]: https://github.com/nextest-rs/nextest/releases/tag/cargo-nextest-0.9.2
 [0.9.1]: https://github.com/nextest-rs/nextest/releases/tag/cargo-nextest-0.9.1
 [0.9.0]: https://github.com/nextest-rs/nextest/releases/tag/cargo-nextest-0.9.0