Fix the whitespace in docker workflow (#3952)

## Issue Addressed

Fix a whitespace issue that was causing failure in the docker build. 


## Additional Info

https://github.com/sigp/lighthouse/pull/3948

.github/workflows/docker.yml

@@ -106,7 +106,7 @@ jobs:
                       --file ./Dockerfile.cross . \
                       --tag ${IMAGE_NAME}:${VERSION}-${SHORT_ARCH}${VERSION_SUFFIX}${MODERNITY_SUFFIX}${FEATURE_SUFFIX} \
                       --build-arg FEATURES=${FEATURES} \
-                      --provenance=false \                      
+                      --provenance=false \
                       --push
     build-docker-multiarch:
         name: build-docker-multiarch${{ matrix.modernity }}