Don't use patched crates

[emilk]

@azazdeaz pointed out that you currently cant use our Rust SDK together with bevy, because we are using a patched version of wgpu.

In general, we cannot publish any crates if we use patched dependencies.

This means we need to publish a new egui before our first Rerun Rust SDK release. We also need to use new releases of wgpu and arrow.

• wgpu
• gltf
• arrow stuff:
  • arrow2
  • arrow2-convert
    • Update to arrow2 0.16 DataEngineeringLabs/arrow2-convert#95
    • Enable using Buffer<T> for Serialize/Deserialize DataEngineeringLabs/arrow2-convert#98
    • Needs another release
  • polars
    • New polars release with arrow2 0.16 pola-rs/polars#6747
• egui/eframe etc
  • egui 0.21 released
  • Update to egui 0.21.0 ItsEthra/egui-notify#10
  • Update to egui 0.21.0 Adanos020/egui_dock#93
  • Update some crates in anticipation of egui 0.21 #1154