Revert jsdom dependency until scala-js-env-jsdom-nodejs is released

Downgrade jsdom dependency from version 27.0.0 to 26.1.0.

This has to be kept until the lib is released with the scala-js/scala-js-env-jsdom-nodejs#58 PR.

Author: carlosedp

package.json

@@ -5,7 +5,7 @@
   "license": "MIT",
   "version": "0.0.1",
   "dependencies": {
-    "jsdom": "^27.0.0"
+    "jsdom": "^26.1.0"
   },
   "engines": {
     "node": ">=24.0.0"