fix(config/jest): add jest-environment-jsdom as a dependency

Jest no longer bundles it as of 28.x... which makes sense as installing
JSDOM when we're using the default `testEnvironment` (`node`) is
pretty silly. For now I'm opting to continue bundling it for the sake
of simplicity, but we should probably consider modularizing
@hover/javascript in the future.

package.json

@@ -83,6 +83,7 @@
     "glob": "^8.0.3",
     "is-ci": "^3.0.1",
     "jest": "^29.0.2",
+    "jest-environment-jsdom": "^29.0.3",
     "jest-github-actions-reporter": "^1.0.3",
     "jest-watch-typeahead": "^2.1.1",
     "lint-staged": "^12.3.4",