Fix incorrect line separator

On Windows, we are supposed to use "`" instead of "\"

PiperOrigin-RevId: 730916160

Author: nitins17

.github/workflows/windows_ci.yml

@@ -67,7 +67,7 @@ jobs:
           PY_COLORS: 1
         run: |
           cd jax
-          python -m uv pip install --pre --find-links ${{ github.workspace }}\jax\dist jaxlib \
+          python -m uv pip install --pre --find-links ${{ github.workspace }}\jax\dist jaxlib `
             -e ${{ github.workspace }}\jax
           echo "JAX_ENABLE_CHECKS=$JAX_ENABLE_CHECKS"
           pytest -n auto --tb=short tests examples