feat(dynamodb): adding update call to dynamodb library

[marciocadev]

It was not possible to partially update an item with the current methods (it might be possible with transactWrite, but it seemed counterintuitive to me). I added the update method to allow this.

[wing-cloud-platform]

App	Status	Console	Endpoints	Updated (UTC)
eladb/winglibs	Stopped			22-6-2024 0:2 (UTC)

[eladcon]

Need to update the version in package.json

[mergify]

Thanks for contributing, @marciocadev! This PR will now be added to the merge queue, or immediately merged if dynamodb-update is up-to-date with main and the queue is empty.