feat: upgrade nodejs-loopback stack to the latest version of LoopBack

[raymondfeng]

This PR upgrade nodejs-loopback stack to use latest version of LoopBack.

Modifying an existing stack:

• [x] Updated the stack version in stack.yaml

Contributing a new stack:

• Describe how application dependencies are managed:

• Explain how Appsody file watcher is utilized:

• Describe other Appsody environment variables defined by the stack image:

• Describe any limitations and known issues:

Related Issues:

[raymondfeng]

Looks good but the version needs to be bumped in the package.json also

Fixed.