Auto merge of #14382 - ehuss:macos-14-nightly, r=epage

CI: Switch macos aarch64 to nightly

We will be promoting aarch64-apple-darwin to tier 1 soon via rust-lang/rust#128592. This updates our CI so that aarch64-apple-darwin runs the full test suite on nightly to keep this in-line with tier-1 support.

This also removes the x86_64 stable macos job and replaces it with aarch64, mainly because aarch64 runs much faster, and presumably x86_64 support will go away some day.

.github/workflows/main.yml

@@ -140,17 +140,17 @@ jobs:
  os: ubuntu-latest
  rust: nightly
  other: i686-unknown-linux-gnu
- - name: macOS x86_64 stable
- os: macos-13
+ - name: macOS aarch64 stable
+ os: macos-14
  rust: stable
- other: x86_64-apple-ios
+ other: x86_64-apple-darwin
  - name: macOS x86_64 nightly
  os: macos-13
  rust: nightly
  other: x86_64-apple-ios
- - name: macOS aarch64 stable
+ - name: macOS aarch64 nightly
  os: macos-14
- rust: stable
+ rust: nightly
  other: x86_64-apple-darwin
  - name: Windows x86_64 MSVC stable
  os: windows-latest