No. Installing apps via APK does not void hardware warranties, but it may expose you to security risks.
While originally a PC mod, many versions have been adapted for Android as "modpacks" for the mobile port of GTA San Andreas. Base Game Requirement: Most modpacks require you to have the original GTA San Andreas APK installed first. APK/Modpack Sources: Namaste America Game Download For Android Apk
GTA Namaste America is a popular unofficial "modded" version of Grand Theft Auto: San Andreas Namaste America Game Download For Android Apk