fix: Set macOS deployment target to 15.6 in project configuration

Author: EricYang801

Launchpad_Back.xcodeproj/project.pbxproj

@@ -410,6 +410,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 15.6;
 				MARKETING_VERSION = 1.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Eric-Yang.Launchpad-Back";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -443,6 +444,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 15.6;
 				MARKETING_VERSION = 1.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Eric-Yang.Launchpad-Back";
 				PRODUCT_NAME = "$(TARGET_NAME)";