Fix syntax error

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
   rust-test:
     runs-on: ${{ matrix.os }}
 
-    continue-on-error: ${{ matrix.toolchain != 'stable' || (matrix.toolchain == 'macos-latest' && contains(matrix.features, 'timestamps') }}
+    continue-on-error: ${{ matrix.toolchain != 'stable' || (matrix.toolchain == 'macos-latest' && contains(matrix.features, 'timestamps')) }}
 
     strategy:
       matrix: