Upgrade to Bevy 0.17

[rparrett]

Bevy 0.17 didn't land a text input, so bevy_simple_text_input lives to see another day!

There probably won't be a crates.io release until Bevy 0.17.0 is properly released, but you can use this git branch in the mean time.

[dependencies.bevy_simple_text_input]
git = "https://github.com/rparrett/bevy_simple_text_input.git"
branch = "bevy-0.17"