fix(ci): remove --no-build from pack step to fix NU5017 for Differential

The --no-build flag causes dotnet pack to fail with NU5017 for
GeneralUpdate.Differential which needs pack to trigger its build.
Removing --no-build lets each pack command build independently.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: JusterZhu

.github/workflows/dotnet-ci.yaml

@@ -41,8 +41,7 @@ jobs:
               -c Release `
               -o ./nupkgs `
               -p:Version='${{ github.event.inputs.version }}' `
-              -p:PackageVersion='${{ github.event.inputs.version }}' `
-              --no-build  # 避免重复构建，使用已生成的文件
+              -p:PackageVersion='${{ github.event.inputs.version }}'
           }
         shell: pwsh