build.gradle: Restore juniversalchardet to 2.0.3

Newer versions cause crashes in android < 7. This was mistakenly bumped in dependabot

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

build.gradle

@@ -263,7 +263,7 @@ dependencies {
     implementation "androidx.work:work-runtime:$workRuntime"
     implementation "androidx.work:work-runtime-ktx:$workRuntime"
     implementation "androidx.fragment:fragment-ktx:1.4.1"
-    implementation 'com.github.albfernandez:juniversalchardet:2.3.2' // need this version for Android <7
+    implementation 'com.github.albfernandez:juniversalchardet:2.0.3' // need this version for Android <7
     compileOnly 'com.google.code.findbugs:annotations:3.0.1u2'
     implementation 'commons-io:commons-io:2.11.0'
     implementation 'org.greenrobot:eventbus:3.3.1'