Bump Remaining Plugin Example Apps to targetSdkVersion >= 34 and compileSdkVersion >= 34 (#8361)

Bumping `local_auth_android` and `all_packages` to `targetSdkVersion` >= 34. Also bumping `compileSdkVersion` to >=34 for `all_packages`.

Fixes [#152929](flutter/flutter#152929)

Author: jesswrd

.ci/legacy_project/all_packages/android/app/build.gradle

@@ -24,12 +24,12 @@ if (flutterVersionName == null) {
 
 android {
     namespace = "com.example.all_packages"
-    compileSdkVersion 33
+    compileSdkVersion flutter.compileSdkVersion
 
     defaultConfig {
         applicationId "com.example.all_packages"
         minSdkVersion flutter.minSdkVersion
-        targetSdkVersion 30
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

.ci/legacy_project/all_packages/android/app/src/main/AndroidManifest.xml

@@ -9,6 +9,7 @@
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
+            android:exported="true"
             android:windowSoftInputMode="adjustResize">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user

packages/local_auth/local_auth_android/example/android/app/build.gradle

@@ -30,7 +30,7 @@ android {
     defaultConfig {
         applicationId "io.flutter.plugins.localauthexample"
         minSdkVersion flutter.minSdkVersion
-        targetSdkVersion 34
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"