feat: remove date-fns dep

[GlennGeenen]

Ran npm audit fix to remove a high risk.

Removed date-fns dependency as it's large for not really being used.

Checklist

• npm test passes and has 100% coverage

[prashantswami]

This is just bug fixing? I think we should update minor version. As we are removing package.

[seppevs]

Feature is in migrate-mongo v12 now

[nathan-knight]

@seppevs this doesn't seem to be in migrate-mongo v12, the package is still listed as a dependency:

migrate-mongo/package.json

Line 30 in 5a40ba2

"date-fns": "^2.28.0",

and is still used:

migrate-mongo/lib/utils/date.js

Line 16 in 5a40ba2

const nowAsString = () => format(now(), "yyyyMMddHHmmss");

Although in the 12.0.0 changelog you credited this PR with removing it