fix: align react-dom peerDependency with react version range

Closes #28
Closes #30

The react peerDependency supports React 16.8+, 17, 18, and 19, but
react-dom was locked to ^18.2.0, causing peer dependency warnings for
users on React 17 and earlier.

This aligns react-dom to match the react version range, allowing the
library to work correctly across all supported React versions.

Author: Erik Rasmussen

package.json

@@ -92,7 +92,7 @@
   "peerDependencies": {
     "final-form": ">=5.0.0",
     "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0",
-    "react-dom": "^18.2.0",
+    "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0",
     "react-final-form": ">=7.0.0"
   },
   "jest": {