Fix toolchain

Author: theory

.github/workflows/test-and-lint.yml

@@ -17,7 +17,7 @@ jobs:
         uses: Swatinem/rust-cache@v2
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@stable
-        with: { toolchain: matrix.toolchain }
+        with: { toolchain: "${{ matrix.toolchain }}" }
       - name: Test
         run: make test
 
@@ -31,8 +31,5 @@ jobs:
         uses: Swatinem/rust-cache@v2
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@stable
-        with: { components: llvm-tools }
-      - name: Install Crates
-        run: cargo install grcov
       - name: Run pre-commit
         uses: pre-commit/[email protected]