Bump node to v16

[djsmith85]

Type of change

• Bug fix
• New feature development
• Tech debt (refactoring, code cleanup, dependency upgrades, etc)
• Build/deploy pipeline (DevOps)
• Other

Objective

With our plan to bump electron soon, we need to upgrade Node to v16 (LTS) as newer version of electron require it.

Depends on bitwarden/jslib#575
Asana task: https://app.asana.com/0/1200804338582616/1201498644188828/f

Code changes

• jslib: Bump jslib from Bump node to 16 and npm  jslib#575
• .nvmrc: Set it require to node 16.13.1
• package.json: Updated engine requirements and bumped @types/node to 16.11.12
• package-lock.json: Updates after running npm i
• build.yml: Setting the build to require node v16 and npm v8
• README.md: Updated requirements

Testing requirements

Will require running regression testing.

Before you submit

• I have checked for linting errors (npm run lint) (required)
• This change requires a documentation update (notify the documentation team)
• This change has particular deployment requirements (notify the DevOps team)