Update the repo for the 3.22 stable release (#6730)

Does all of the steps of https://github.com/flutter/flutter/wiki/Updating-Packages-repo-for-a-stable-release other than the first (which is flutter/packages#6727).

Author: stuartmorgan-g

google_maps_flutter/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+* Updates minimum supported SDK version to Flutter 3.16/Dart 3.2.
+
 ## 2.6.1
 
 * Updates the minimum version of the iOS implementation package to a version

google_maps_flutter/example/pubspec.yaml

@@ -3,8 +3,8 @@ description: Demonstrates how to use the google_maps_flutter plugin.
 publish_to: none
 
 environment:
-  sdk: ^3.1.0
-  flutter: ">=3.13.0"
+  sdk: ^3.2.0
+  flutter: ">=3.16.0"
 
 dependencies:
   cupertino_icons: ^1.0.5

google_maps_flutter_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+* Updates minimum supported SDK version to Flutter 3.16/Dart 3.2.
+
 ## 2.8.0
 
 * Adds support for marker clustering.

google_maps_flutter_android/example/pubspec.yaml

@@ -3,8 +3,8 @@ description: Demonstrates how to use the google_maps_flutter plugin.
 publish_to: none
 
 environment:
-  sdk: ^3.1.0
-  flutter: ">=3.13.0"
+  sdk: ^3.2.0
+  flutter: ">=3.16.0"
 
 dependencies:
   cupertino_icons: ^1.0.5

google_maps_flutter_android/pubspec.yaml

@@ -5,8 +5,8 @@ issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+
 version: 2.8.0
 
 environment:
-  sdk: ^3.1.0
-  flutter: ">=3.13.0"
+  sdk: ^3.2.0
+  flutter: ">=3.16.0"
 
 flutter:
   plugin:

google_maps_flutter_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+* Updates minimum supported SDK version to Flutter 3.16/Dart 3.2.
+
 ## 2.6.0
 
 * Adds support for marker clustering.

google_maps_flutter_platform_interface/pubspec.yaml

@@ -7,8 +7,8 @@ issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+
 version: 2.6.0
 
 environment:
-  sdk: ^3.1.0
-  flutter: ">=3.13.0"
+  sdk: ^3.2.0
+  flutter: ">=3.16.0"
 
 dependencies:
   collection: ^1.15.0