chore: Removed Rust toolchain from CI

.github/workflows/ci.yml

@@ -8,18 +8,15 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: nightly
-          override: true
-      - name: Install cargo-audit and clippy
-        run: cargo install cargo-audit cargo-clippy
+      - name: Set up Rust
+        uses: actions/checkout@v4
+      - name: Install cargo-audit
+        run: cargo install cargo-audit
       - name: Build
         run: cargo build --verbose
       - name: Run tests
         run: cargo test --verbose
       - name: Run clippy
-        run: cargo clippy --verbose
+        run: cargo clippy --verbose -- -D warnings
       - name: Run audit
         run: cargo audit