Fix bash syntax

Author: asmeurer

.github/workflows/tests.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Run Tests
         run: |
-          if [ "${{ matrix.numpy-version }}" == "1.21" || "${{ matrix.numpy-version }}" == "dev" ]; then
+          if [[ "${{ matrix.numpy-version }}" == "1.21" || "${{ matrix.numpy-version }}" == "dev" ]]; then
              PYTEST_EXTRA=(-k "numpy and not jax")
           fi
           pytest "${PYTEST_EXTRA[@]}"