build(debian): add libgmock-dev to build dependencies

Add libgmock-dev to Build-Depends in debian/control for gmock support

Log: Add libgmock-dev build dependency

Influence:
1. Verify package builds correctly with new dependency
2. Check gmock functionality in tests

build(debian): 添加 libgmock-dev 构建依赖

在 debian/control 的 Build-Depends 中添加 libgmock-dev 以支持 gmock

Log: 添加 libgmock-dev 构建依赖

Influence:
1. 验证软件包在新依赖下正确构建
2. 检查测试中的 gmock 功能

Author: heysion

debian/control

@@ -15,6 +15,7 @@ Build-Depends:
  libdtk6widget-dev,
  libdtkcommon-dev,
  libgtest-dev,
+ libgmock-dev,
  libicu-dev,
  libqt6svg6,
  libxcb-ewmh-dev,