npm(deps-dev): bump @github/copilot from 0.0.420 to 0.0.423

Bumps [@github/copilot](https://github.com/github/copilot-cli) from 0.0.420 to 0.0.423.
- [Release notes](https://github.com/github/copilot-cli/releases)
- [Changelog](https://github.com/github/copilot-cli/blob/main/changelog.md)
- [Commits](github/copilot-cli@v0.0.420...v0.0.423)

---
updated-dependencies:
- dependency-name: "@github/copilot"
  dependency-version: 0.0.423
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package-lock.json

@@ -286,7 +286,7 @@
     "sync-changelog:test": "node scripts/sync-changelog.js --test"
   },
   "devDependencies": {
-    "@github/copilot": "^0.0.420",
+    "@github/copilot": "^0.0.423",
     "@types/mocha": "^10.0.10",
     "@types/node": "^25.3.3",
     "@types/vscode": "1.109.0",