node14 based functions are executed using Node.js v12

[ggrussenmeyer]

Expected Behaviour

When I build a function using the node14 template, the function is run using Node.js v14.

Current Behaviour

When I build a function using the node14 template, the function is run using Node.js v12.

Possible Solution

Replace the version number of the Node.js Docker image referenced in the node14 template Dockerfile.

Steps to Reproduce (for bugs)

1. Build a function using the node14 template.
2. Use Docker with the built image to display the Node.js version (docker run <image_name> node --version).
3. Observe that the output (i.e. the Node.js version) is v12.x.y.

Context

Trying to run a function using Node.js v14.

Your Environment

Not relevant.