update minimum macOS version for counter example to v13

Author: lhoward

Examples/counter/macos/Runner.xcodeproj/project.pbxproj

@@ -508,7 +508,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				MACOSX_DEPLOYMENT_TARGET = 13.5;
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_OBJC_INTEROP_MODE = objcxx;
 				SWIFT_VERSION = 5.0;
@@ -642,7 +642,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				MACOSX_DEPLOYMENT_TARGET = 13.5;
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_OBJC_INTEROP_MODE = objcxx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
@@ -664,7 +664,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				MACOSX_DEPLOYMENT_TARGET = 13.5;
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_OBJC_INTEROP_MODE = objcxx;
 				SWIFT_VERSION = 5.0;