Follow-up to r1909281.

* .github/workflows/windows-cmake.yml: Fix syntax error.


git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1909282 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/.github/workflows/windows-cmake.yml b/.github/workflows/windows-cmake.yml
index 3d11242..414fdf3 100644
--- a/.github/workflows/windows-cmake.yml
+++ b/.github/workflows/windows-cmake.yml
@@ -30,7 +30,8 @@
       - uses: actions/checkout@v3
 
       - name: Configure CMake
-        run: cmake \
+        run: |
+            cmake \
             -B ${{github.workspace}}/build \
             -DCMAKE_BUILD_TYPE=${{ matrix.build-type }} \
             -G "${{ matrix.generator }}" \