Updated to use H2 DB

[bkakadiya]

Hi,

I loved article at https://www.bezkoder.com/spring-boot-jwt-authentication/

I did few changes

1. Added "/error" in to permit all, so that it can keep returning default json format response for access denied
2. Updated to use java 11
3. Updated to use h2 db, to avoid need of my sql server.

Thanks,
Bakul