ci: use setup-rust-toolchain, as it works reliably

Author: auxesis

.github/workflows/test-eql.yml

@@ -41,15 +41,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install rust
-        shell: /bin/bash -l {0}
-        run: |
-          rustup toolchain install stable --profile minimal --no-self-update
-          rustup component add rustfmt
-
-      - name: Setup Rust cache
-        uses: Swatinem/rust-cache@v2
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
+          toolchain: stable
+          components: rustfmt
+          cache: true
           cache-all-crates: true
 
       - uses: jdx/mise-action@v2