update ios deployment target to 15.0

Author: HannahShiSFB

scripts/build_commons.sh

@@ -9,7 +9,7 @@ GRPC_IOS_BUILD_FLAGS="
   CODE_SIGNING_ALLOWED=NO
   ONLY_ACTIVE_ARCH=NO
   ARCHS=arm64
-  IPHONEOS_DEPLOYMENT_TARGET=12.0
+  IPHONEOS_DEPLOYMENT_TARGET=15.0
 "
 
 # Xcodebuild destination for iOS

tests/cocoapod/gRPCSample/Podfile

@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '11.0'
+platform :ios, '15.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 

tests/cocoapod/gRPCSample/gRPCSample.xcodeproj/project.pbxproj

@@ -221,7 +221,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
 				ONLY_ACTIVE_ARCH = YES;
@@ -273,7 +273,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				SDKROOT = iphoneos;

tests/spm/gRPCSample/gRPCSample.xcodeproj/project.pbxproj

@@ -196,7 +196,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
 				ONLY_ACTIVE_ARCH = YES;
@@ -251,7 +251,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				SDKROOT = iphoneos;