Update sdk constraint range and update runners (#1706)

platform_channels/android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="dev.flutter.platform_channels">
-   <application
+    <application
         android:label="platform_channels"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">

platform_channels/android/build.gradle

@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.2.0'
+        classpath 'com.android.tools.build:gradle:7.3.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }