fix(create-graphback): update import format

[namit-chandwani]

The following error causes the create-graphback package to break:

TypeError: request_1.default is not a function
    at /home/namit/.npm/_npx/110767/lib/node_modules/create-graphback/dist/init/starterTemplates.js:140:30
    at new Promise (<anonymous>)
    at /home/namit/.npm/_npx/110767/lib/node_modules/create-graphback/dist/init/starterTemplates.js:139:15
    at Generator.next (<anonymous>)
    at /home/namit/.npm/_npx/110767/lib/node_modules/create-graphback/node_modules/tslib/tslib.js:115:75
    at new Promise (<anonymous>)
    at Object.__awaiter (/home/namit/.npm/_npx/110767/lib/node_modules/create-graphback/node_modules/tslib/tslib.js:111:16)
    at downloadRepository (/home/namit/.npm/_npx/110767/lib/node_modules/create-graphback/dist/init/starterTemplates.js:133:20)
    at Object.<anonymous> (/home/namit/.npm/_npx/110767/lib/node_modules/create-graphback/dist/init/starterTemplates.js:180:32)
    at Generator.next (<anonymous>)

This PR fixes the error by updating the import format of a package in the starterTemplates.ts file.

Types of changes

What types of changes does your code introduce to Graphback?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Other (please specify)

Checklist

• I have read the CONTRIBUTING document.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Verification

Further comments