Fix msbuild parameter syntax in GitHub Actions workflow

The msbuild command in the GitHub Actions workflow had a syntax error where a dash was incorrectly used instead of a colon for the BuildProjectReferences parameter. This fix ensures that the solution builds correctly by using the proper parameter notation.

.github/workflows/main.yml

@@ -31,7 +31,7 @@ jobs:
 
       # Build the solution
       - name: Build solution
-        run: msbuild "source\Plugins.sln" /p:Configuration=Release -p BuildProjectReferences=false
+        run: msbuild "source\Plugins.sln" /p:Configuration=Release /p:BuildProjectReferences=false
 
           # Run tests (optional)
           #- name: Run tests