[ci] fix link to LightGBM public e-mail (#4603)
[ci] fix link to LightGBM public e-mail (#4603)


microsoft/LightGBM,microsoft/LightGBM,henry0312/LightGBM,henry0312/LightGBM,microsoft/LightGBM,henry0312/LightGBM,microsoft/LightGBM,henry0312/LightGBM,henry0312/LightGBM,microsoft/LightGBM