Try to fix config

Author: sergregory

.github/workflows/build_wheels.yml

@@ -47,7 +47,7 @@ jobs:
       DOCKER_IMAGE: quay.io/skvark/manylinux2014_${PLAT}
       USE_CCACHE: 1
       UNICODE_WIDTH: 32
-      SDIST: ${{ matrix.build_sdist }}
+      SDIST: ${{ matrix.build_sdist}}
       ENABLE_HEADLESS: ${{ matrix.without_gui }}
       ENABLE_CONTRIB: ${{ matrix.with_contrib }}