ci: Don't use actions-rs actions (#498)

These haven't been maintained in some time, so just do the steps directly as other jobs do.

Author: waywardmonkeys

.github/workflows/ci.yml

@@ -8,10 +8,8 @@ jobs:
  steps:
  - uses: actions/checkout@v4
 
- - uses: actions-rs/toolchain@v1
- with:
- toolchain: stable
- components: rustfmt, clippy
+ - run: rustup update --no-self-update stable
+ - run: rustup default stable
 
  # make sure all code has been formatted with rustfmt and linted with clippy
  - name: rustfmt