Fix line continuation character in Windows wheel build.

Author: hawkinsp

.github/workflows/wheel_win_x64.yml

@@ -38,7 +38,7 @@ jobs:
           JAXLIB_RELEASE: true
         run: |
           python -m pip install uv~=0.5.30
-          python -m uv pip install -r build/test-requirements.txt \
+          python -m uv pip install -r build/test-requirements.txt `
             --upgrade numpy==2.0.0 scipy==1.13.1
           "C:\\msys64\\;C:\\msys64\\usr\\bin\\;" >> $env:GITHUB_PATH
           python.exe build\build.py build --wheels=jaxlib `
@@ -58,7 +58,7 @@ jobs:
           JAX_SKIP_SLOW_TESTS: true
           PY_COLORS: 1
         run: |
-          python -m uv pip install --find-links ${{ github.workspace }}\dist jaxlib \
+          python -m uv pip install --find-links ${{ github.workspace }}\dist jaxlib `
             -e ${{ github.workspace }}
           echo "JAX_ENABLE_CHECKS=$JAX_ENABLE_CHECKS"
           pytest -n auto --tb=short tests examples