fix(unlock-app): address some types issues with captcha

[clemsos]

Description

This fixes the following type issue in unlock-app

./src/components/content/event/Registration/WalletlessRegistration.tsx:268:8
Type error: 'ReCaptcha' cannot be used as a JSX component.
  Its type 'typeof ReCAPTCHA' is not a valid JSX element type.
    Type 'typeof ReCAPTCHA' is not assignable to type 'new (props: any, deprecatedLegacyContext?: any) => Component<any, any, any>'.
      Construct signature return types 'ReCAPTCHA' and 'Component<any, any, any>' are incompatible.
        The types returned by 'render()' are incompatible between these types.
          Type 'import("/home/unlock/node_modules/@types/react-dom/node_modules/@types/react/index").ReactNode' is not assignable to type 'React.ReactNode'.
            Type 'ReactElement<any, string | JSXElementConstructor<any>>' is not assignable to type 'ReactNode'.
              Property 'children' is missing in type 'ReactElement<any, string | JSXElementConstructor<any>>' but required in type 'ReactPortal'.

  266 |       className="flex flex-col w-full gap-4"
  267 |     >
> 268 |       <ReCaptcha
      |        ^
  269 |         ref={recaptchaRef}
  270 |         sitekey={config.recaptchaKey}
  271 |         size="invisible"

Issues

Fixes #
Refs #

Checklist:

• 1 PR, 1 purpose: my Pull Request applies to a single purpose
• I have commented my code, particularly in hard-to-understand areas
• I have updated the docs to reflect my changes if applicable
• I have added tests (and stories for frontend components) that prove my fix is effective or that my feature works
• I have performed a self-review of my own code
• If my code involves visual changes, I am adding applicable screenshots to this thread

Release Note Draft Snippet