Support node > 8

[nathanweeks]

Currently the Dockerfile & installation scripts appear to be compatible with node 8.x and npm 3.x (both long since EOL), currently installed on ubuntu:18.04 (also EOL) in the docker/Dockerfile, but not, e.g. nodejs 10.19.0 & npm 6.14.4 available for ubuntu 20.04:

$ docker run -it -v .:/app ubuntu:20.04
# apt update && DEBIAN_FRONTEND=noninteractive apt install -y npm
...
# cd /app && npm install 
...
# cp conf/examples/amigo.yaml.tomodachi conf/amigo.yaml
# ./node_modules/.bin/gulp install
...
npm ERR! code EINTEGRITY
npm ERR! sha1-pO5xiCFDkBUx/BcPbSKvBTVloMU= integrity checksum failed when using sha1: wanted sha1-pO5xiCFDkBUx/BcPbSKvBTVloMU= but got sha512-z4PhNX7vuL3xVChQ1m2AB9Yg5AULVxXcg/SpIdNs6c5H0NE8XYXysP+DGNKHfuwvY7kxvUdBeoGlODJ6+SfaPg== sha1-2jmj7l5rSw0yVb/vlWAYkK/YBwk=. (0 bytes)
...
npm ERR! Callback called more than once.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2023-12-26T19_59_23_059Z-debug.log
[19:59:31] 'build' errored after 17 s 
[19:59:31] Error: Command `cd ./javascript/npm/amigo2-instance-data && npm install` exited with code: 1
    at formatError (/app/node_modules/gulp/node_modules/gulp-cli/lib/versioned/^4.0.0/format-error.js:21:10)
    at Gulp.<anonymous> (/app/node_modules/gulp/node_modules/gulp-cli/lib/versioned/^4.0.0/log/events.js:33:15)
    at Gulp.emit (events.js:203:15)
    at Gulp.EventEmitter.emit (domain.js:448:20)
    at Object.error (/app/node_modules/undertaker/lib/helpers/createExtensions.js:61:10)
    at handler (/app/node_modules/now-and-later/lib/mapSeries.js:47:14)
    at f (/app/node_modules/once/once.js:25:25)
    at f (/app/node_modules/once/once.js:25:25)
    at tryCatch (/app/node_modules/async-done/index.js:24:15)
    at done (/app/node_modules/async-done/index.js:40:12)
[19:59:31] 'install' errored after 17 s 

It would be helpful from a security and compatibility standpoint if the package*json files were updated to be compatible with more-recent nodejs versions (that are available to newer / still-supported Ubuntu releases).