[shared_preferences] Bump minimum Flutter version and iOS deployment target (#4357)

diff --git a/packages/shared_preferences/shared_preferences/CHANGELOG.md b/packages/shared_preferences/shared_preferences/CHANGELOG.md
index 57b35a8..db12fd1 100644
--- a/packages/shared_preferences/shared_preferences/CHANGELOG.md
+++ b/packages/shared_preferences/shared_preferences/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.8
+
+* Update minimum Flutter SDK to 2.5 and iOS deployment target to 9.0.
+
 ## 2.0.7
 
 * Add iOS unit test target.
diff --git a/packages/shared_preferences/shared_preferences/example/ios/Flutter/AppFrameworkInfo.plist b/packages/shared_preferences/shared_preferences/example/ios/Flutter/AppFrameworkInfo.plist
index 6c2de80..3a9c234 100644
--- a/packages/shared_preferences/shared_preferences/example/ios/Flutter/AppFrameworkInfo.plist
+++ b/packages/shared_preferences/shared_preferences/example/ios/Flutter/AppFrameworkInfo.plist
@@ -25,6 +25,6 @@
     <string>arm64</string>
   </array>
   <key>MinimumOSVersion</key>
-  <string>8.0</string>
+  <string>9.0</string>
 </dict>
 </plist>
diff --git a/packages/shared_preferences/shared_preferences/example/ios/Runner.xcodeproj/project.pbxproj b/packages/shared_preferences/shared_preferences/example/ios/Runner.xcodeproj/project.pbxproj
index 395e300..c7567b3 100644
--- a/packages/shared_preferences/shared_preferences/example/ios/Runner.xcodeproj/project.pbxproj
+++ b/packages/shared_preferences/shared_preferences/example/ios/Runner.xcodeproj/project.pbxproj
@@ -443,7 +443,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -493,7 +493,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				TARGETED_DEVICE_FAMILY = "1,2";
diff --git a/packages/shared_preferences/shared_preferences/example/pubspec.yaml b/packages/shared_preferences/shared_preferences/example/pubspec.yaml
index 8f14d5c..1cb0f18 100644
--- a/packages/shared_preferences/shared_preferences/example/pubspec.yaml
+++ b/packages/shared_preferences/shared_preferences/example/pubspec.yaml
@@ -3,8 +3,8 @@
 publish_to: none
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
-  flutter: ">=1.9.1+hotfix.2"
+  sdk: ">=2.14.0 <3.0.0"
+  flutter: ">=2.5.0"
 
 dependencies:
   flutter:
diff --git a/packages/shared_preferences/shared_preferences/ios/shared_preferences.podspec b/packages/shared_preferences/shared_preferences/ios/shared_preferences.podspec
index bd239ec..0cb5d35 100644
--- a/packages/shared_preferences/shared_preferences/ios/shared_preferences.podspec
+++ b/packages/shared_preferences/shared_preferences/ios/shared_preferences.podspec
@@ -17,7 +17,7 @@
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
   
-  s.platform = :ios, '8.0'
-  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'VALID_ARCHS[sdk=iphonesimulator*]' => 'x86_64' }
+  s.platform = :ios, '9.0'
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }
 end
 
diff --git a/packages/shared_preferences/shared_preferences/pubspec.yaml b/packages/shared_preferences/shared_preferences/pubspec.yaml
index e3cdfe4..1e59edf 100644
--- a/packages/shared_preferences/shared_preferences/pubspec.yaml
+++ b/packages/shared_preferences/shared_preferences/pubspec.yaml
@@ -3,11 +3,11 @@
   Wraps NSUserDefaults on iOS and SharedPreferences on Android.
 repository: https://github.com/flutter/plugins/tree/master/packages/shared_preferences/shared_preferences
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+shared_preferences%22
-version: 2.0.7
+version: 2.0.8
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
-  flutter: ">=2.0.0"
+  sdk: ">=2.14.0 <3.0.0"
+  flutter: ">=2.5.0"
 
 flutter:
   plugin: