title: Android minSdkVersion with Flutter(v2.8.1)
body: <p>I have installed the firebase package. as we know <code>minSdkVersion 19</code> is recommended. So, I wanted to do this process. however, I saw that this line is included in the <code>android/app/build.gradle</code> file</p>
  <pre><code>minSdkVersion flutter.minSdkVersion
  </code></pre>
  <p>The previous view would be as follows</p>
  <pre><code>minSdkVersion 16
  </code></pre>
  <p>Is it possible to change the version with a file? that is, whether the value for minSdkVersion is split into another file?</p>
  <p>Thanks!</p>