Bump itty-router from 4.2.0 to 4.2.1

Bumps [itty-router](https://github.com/kwhitley/itty-router) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/kwhitley/itty-router/releases)
- [Changelog](https://github.com/kwhitley/itty-router/blob/v4.x/CHANGELOG.md)
- [Commits](kwhitley/itty-router@v4.2.0...v4.2.1)

---
updated-dependencies:
- dependency-name: itty-router
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -16,7 +16,7 @@
 		"prepublishOnly": "TypeScriptESBuild 'Source/**/*.ts'"
 	},
 	"dependencies": {
-		"itty-router": "4.2.0"
+		"itty-router": "4.2.1"
 	},
 	"devDependencies": {
 		"@cloudflare/workers-types": "4.20240312.0",