I don't even know. Some magic that I found on the internet...

android/app/build.gradle

@@ -38,7 +38,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "inventree.inventree_app"
-        minSdkVersion 20
+        minSdkVersion 21
         targetSdkVersion 29
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

android/app/src/debug/AndroidManifest.xml

@@ -4,4 +4,6 @@
          to allow setting breakpoints, to provide hot reload, etc.
     -->
     <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-permission android:name="android.permission.MICROPHONE"/>
 </manifest>

android/build.gradle

@@ -19,9 +19,15 @@ allprojects {
 rootProject.buildDir = '../build'
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
-}
-subprojects {
     project.evaluationDependsOn(':app')
+    project.configurations.all {
+        resolutionStrategy.eachDependency { details ->
+            if (details.requested.group == 'androidx.core' &&
+                    !details.requested.name.contains('androidx')) {
+                details.useVersion "1.0.2"
+            }
+        }
+    }
 }
 
 task clean(type: Delete) {