Update openharmony-build.yml

Author: CeSun

.github/workflows/openharmony-build.yml

@@ -27,7 +27,7 @@ jobs:
         mono --version
         
     - name: Set up nuget
-    - uses: nuget/setup-nuget@v2
+      uses: nuget/setup-nuget@v2
 
     - name: Update Submodule
       run: |