Upgrade to `Phoenix 1.7`?

[nelsonic]

At present this demo app uses:

elixir-auth-google-demo/mix.exs

Line 45 in ad1c5bf

{:phoenix, "~> 1.6.15"},

Should we upgrade it to 1.7 RC2?

Instructions to update would be similar to: dwyl/phoenix-chat-example#149
.then we could also update the setup instructions as suggested by @ndrean in dwyl/elixir-auth-google#73 (comment) 💭