fix: Hopefully fix release process (#3156)

The release process fails every time trying to publish the base package
```
lerna info lifecycle react-jsonschema-form@5.0.0~publish: react-jsonschema-form@5.0.0
lerna ERR! lifecycle "publish" errored in "react-jsonschema-form", exiting 1
```
After looking at the [sample repo](https://github.com/lerna/getting-started-example) provided by lerna I noticed that the base `package.json` did not contain a `version` number
- Updated the base `package.json` to remove the `"version": "5.0.0"` tag that appears to be causing the release issue

package.json

@@ -1,6 +1,5 @@
 {
   "name": "react-jsonschema-form",
-  "version": "5.0.0",
   "private": true,
   "description": "monorepo for react-jsonschema-form and its themes",
   "engines": {