Raise MSRV to Rust 1.80

[ErichDonGubler]

• Depends on Firefox updating to Rust 1.80 or later.
• Depends on Preempt unused_qualifications lints triggered in Rust 1.80 #6147.
• Depends on Yet more preempting of Rust 1.80 lints #6180.
• Part of Remove dependency on once_cell #6379.

[ErichDonGubler]

Heeey, we're finally running into the same annoying errors here that I wasn't sure what to do with locally when I saw them:

error: trait `ContextId` is never used
  --> wgpu/src/context.rs:25:11
   |
25 | pub trait ContextId: Into<ObjectId> + From<ObjectId> + Debug + 'static {}
   |           ^^^^^^^^^
   |
   = note: `-D dead-code` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(dead_code)]`

error: methods `device_downlevel_properties`, `device_mark_lost`, `render_bundle_encoder_multi_draw_indirect`, `render_bundle_encoder_multi_draw_indexed_indirect`, `render_bundle_encoder_multi_draw_indirect_count`, and `render_bundle_encoder_multi_draw_indexed_indirect_count` are never used
   --> wgpu/src/context.rs:190:8
    |
34  | pub trait Context: Debug + WasmNotSendSync + Sized {
    |           ------- methods in this trait
...
190 |     fn device_downlevel_properties(
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
290 |     fn device_mark_lost(
    |        ^^^^^^^^^^^^^^^^
...
793 |     fn render_bundle_encoder_multi_draw_indirect(
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
802 |     fn render_bundle_encoder_multi_draw_indexed_indirect(
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
812 |     fn render_bundle_encoder_multi_draw_indirect_count(
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
825 |     fn render_bundle_encoder_multi_draw_indexed_indirect_count(
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: methods `device_downlevel_properties`, `device_mark_lost`, `render_bundle_encoder_multi_draw_indirect`, `render_bundle_encoder_multi_draw_indexed_indirect`, `render_bundle_encoder_multi_draw_indirect_count`, and `render_bundle_encoder_multi_draw_indexed_indirect_count` are never used
    --> wgpu/src/context.rs:1249:8
     |
1171 | pub(crate) trait DynContext: Debug + WasmNotSendSync {
     |                  ---------- methods in this trait
...
1249 |     fn device_downlevel_properties(
     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
1349 |     fn device_mark_lost(&self, device: &ObjectId, device_data: &crate::Data, message: &str);
     |        ^^^^^^^^^^^^^^^^
...
1790 |     fn render_bundle_encoder_multi_draw_indirect(
     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
1799 |     fn render_bundle_encoder_multi_draw_indexed_indirect(
     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
1809 |     fn render_bundle_encoder_multi_draw_indirect_count(
     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
1822 |     fn render_bundle_encoder_multi_draw_indexed_indirect_count(
     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    Checking naga-fuzz v0.0.0 (/Users/runner/work/wgpu/wgpu/naga/fuzz)
    Checking d3d12 v22.0.0 (/Users/runner/work/wgpu/wgpu/d3d12)
error: could not compile `wgpu` (lib) due to 3 previous errors

☝🏻 @cwfitzgerald, @Wumpf: Not sure how to best proceed here, but I haven't given it many brain cycles, either. Will dedicate more in the absence of feedback in the next day or so.

[ErichDonGubler]

Leaving this as a draft until we actually have the option to upgrade to Rust 1.80.

We might be able to hoist the upgrade to cfg_aliases out if katharostech/cfg_aliases#10 merges and is released.