Update CHANGELOG.md (#128)

* Update CHANGELOG.md
* Update README.md

Author: mit-mit

CHANGELOG.md

@@ -1,3 +1,10 @@
+## v1.6.3
+
+* Roll `undici` dependency to address [CVE-2024-30260][] and [CVE-2024-30261][].
+
+[CVE-2024-30260]: https://github.com/nodejs/undici/security/advisories/GHSA-m4v8-wqvr-p9f7
+[CVE-2024-30261]: https://github.com/nodejs/undici/security/advisories/GHSA-9qxr-qj54-h672
+
 ## v1.6.2
 
 * Switch to running the workflow on `node20`` from `node16`. See also

README.md

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 # setup-dart
 
-[setup-dart](https://github.com/dart-lang/setup-dart) installs and sets up a
-Dart SDK for use in GitHub Actions; it:
+[setup-dart][] installs and sets up a Dart SDK for use in GitHub Actions; it:
 
 * downloads the Dart SDK
 * adds the [`dart`](https://dart.dev/tools/dart-tool) tool to the system path
 
+[setup-dart]: https://github.com/marketplace/actions/setup-dart-sdk
+
 ## Usage
 
 To install the latest stable Dart SDK and run typical checks: