Add default `minSdkVersion` and `targetSdkVersion` in the AndroidManifest.xml file

platform/android/java/app/config.gradle

@@ -1,8 +1,8 @@
 ext.versions = [
     androidGradlePlugin: '7.0.3',
     compileSdk         : 30,
-    minSdk             : 19,
-    targetSdk          : 30,
+    minSdk             : 19, // Also update 'platform/android/java/lib/AndroidManifest.xml#minSdkVersion' value
+    targetSdk          : 30, // Also update 'platform/android/java/lib/AndroidManifest.xml#targetSdkVersion' value
     buildTools         : '30.0.3',
     kotlinVersion      : '1.5.10',
     fragmentVersion    : '1.3.6',

platform/android/java/lib/AndroidManifest.xml

@@ -4,6 +4,9 @@
     android:versionCode="1"
     android:versionName="1.0">
 
+    <!-- Should match the mindSdk and targetSdk values in platform/android/java/app/config.gradle -->
+    <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="30" />
+
     <application>
 
         <!-- Records the version of the Godot library -->