feat: update bevy to 0.12

[mikeder]

1. Update Bevy to 0.12
2. Update related deps ( ggrs, bevy_ggrs, matchbox, etc. )
3. Log warning if winit cannot find main window to avoid panic - I don't understand why this changed see below.
4. Switch to 1.72 toolchain due to Rust compiler regression.

Winit Panic

Some new issue was introduced with the Bevy 0.12 upgrade, this line started panicking, so we just log a warning and abort if we can't get the primary window.

https://github.com/mikeder/turtletime/pull/3/files#diff-42cb6807ad74b3e201c5a7ca98b911c5fa08380e942be6e4ac5807f8377f87fcL83

NiklasEi/bevy_game_template#80

Compiler Regression

I was unable to compile bevy-egui-inspector after updating to Rust to the 1.74 toolchain, it turns out there was a compiler regression so I've pinned my toolchain to 1.72 ( there was another regression in 1.73 that sounds nasty enough to avoid for now too )

jakobhellermann/bevy-inspector-egui#163
rust-lang/rust#117976

Segmentation Fault

Originally I tried to use the nightly toolchain as recommended in the above bevy-egui-inspector issue, but when I did, my game instantly crashed with a segmentation fault. I tried to use the sanitizer features to debug it, but the game compiled and ran just fine with the sanitizer flags. Ultimately I just downgraded to 1.72 and moved on with my life.