MdeModulePkg: For RegularExpressionDxe use 'sprintf_s' to replace 'sprintf'.

MdeModulePkg: For RegularExpressionDxe use 'sprintf_s' to replace 'sprintf'.

Function 'sprintf' has potential buffer overflow risk. This patch use 'sprintf_s' to improve the code.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Yao Jiewen <Jiewen.Yao@intel.com>
Reviewed-by: Cinnamon Shia <cinnamon.shia@hpe.com>
Reviewed-by: Samer El-Haj-Mahmoud <elhaj@hpe.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19582 6f19259b-4bc3-4df7-8a09-765794883524