Node 16 support request

[VinWare]

---

Output from ember version --verbose && npm --version && yarn --version:

WARNING: Node v16.10.0 is not tested against Ember CLI on your platform. We recommend that you use the most-recent "Active LTS" version of Node.js. See https://git.io/v7S5n for details.
ember-cli: 3.28.1
node: 16.10.0
v8: 9.3.345.19-node.14
uv: 1.42.0
zlib: 1.2.11
brotli: 1.0.9
ares: 1.17.2
modules: 93
nghttp2: 1.42.0
napi: 8
llhttp: 6.0.2
openssl: 1.1.1l+quic
cldr: 39.0
icu: 69.1
tz: 2021a
unicode: 13.0
ngtcp2: 0.1.0-DEV
nghttp3: 0.1.0-DEV
os: linux x64
7.24.0
1.22.15

Node 16 has been current for almost 6 months and is slated to become the active LTS in this month (October). Requesting to add support, including to the CI to check any commits

[bertdeblock]

I think this is now covered by #9694?

[kellyselden]

Yep thanks