Update to Node v14, v16 or v18

[digitalsadhu]

We are currently using Node v12 which will no longer be supported on AWS Lambda soon so we need to update.
Our dependency on Canvas makes this is a little challenging as we need to upload new lambda layers for these.

I have managed to use this project: https://github.com/jwerre/node-canvas-lambda to upload new layer for both Node 14 and Node 16.

After updating the dev function to Node 16 and adding the new Node 16 layers, my first attempt to test this, however, has resulted in the following error:

To be continued...