Update NumberInput.tsx to typecast to number during onChange event

[dkaushik95]

Closes #15735

This change would typecast the value from the input to number similar to when the step function typecasts. This way, the consumers will always receive a value with type number.

Changelog

New

• {{new thing}}

Changed

• Return value for onChange for value is a type number

Removed

• {{removed thing}}

Testing / Reviewing

{{ Add descriptions, steps or a checklist for how reviewers can verify this PR works or not }}

[github-actions]

DCO Assistant Lite bot All contributors have signed the DCO.

[netlify]

✅ Deploy Preview for v11-carbon-react ready!

Name	Link
🔨 Latest commit	759c4bb
🔍 Latest deploy log	https://app.netlify.com/sites/v11-carbon-react/deploys/65cd0fe36b495a0008df3e75
😎 Deploy Preview	https://deploy-preview-15739--v11-carbon-react.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[dkaushik95]

I have read the DCO document and I hereby sign the DCO.

[tay1orjones]

Thanks for this!