fix(share_plus): raise Apple platform minimums in SPM manifests to match FlutterFramework (#3923)

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: radomir9720

packages/share_plus/share_plus/example/macos/Runner.xcodeproj/project.pbxproj

@@ -553,7 +553,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 10.14;
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = macosx;
 				SWIFT_COMPILATION_MODE = wholemodule;
@@ -632,7 +632,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 10.14;
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
@@ -679,7 +679,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 10.14;
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = macosx;
 				SWIFT_COMPILATION_MODE = wholemodule;

packages/share_plus/share_plus/ios/share_plus/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "share_plus",
     platforms: [
-        .iOS("12.0"),
+        .iOS("13.0"),
     ],
     products: [
         .library(name: "share-plus", targets: ["share_plus"])

packages/share_plus/share_plus/macos/share_plus/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "share_plus",
     platforms: [
-        .macOS("10.14")
+        .macOS("10.15")
     ],
     products: [
         .library(name: "share-plus", targets: ["share_plus"])