Deprecate node 16, use only latest supported node

[asaaki]

See https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/lambda-at-edge-function-restrictions.html#lambda-at-edge-restrictions-runtime

[asaaki]

Location:

rust-wasm-on-lambda-edge/.github/workflows/ci.yaml

Lines 12 to 20 in 1df3d8b

	jobs:
	build_and_test:
	name: Build and test
	runs-on: ubuntu-22.04
	strategy:
	matrix:
	# https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/edge-functions-restrictions.html#lambda-at-edge-runtime-restrictions
	# note: only use active versions; EOLs will be dropped
	node-version: ['16', '14']

notes

• also update ubuntu image
• use single version for node; no need to promote almost EOL (April 2025)
• node v22 is not supported on either lambda or lambda edge