demote okhttp to 3.12 to work with old android

build.gradle

@@ -68,7 +68,7 @@ dependencies {
     implementation "com.leinardi.android:speed-dial:2.0.1"
     implementation 'com.squareup.retrofit2:retrofit:2.6.1'
     implementation 'com.squareup.retrofit2:converter-gson:2.6.1'
-    implementation 'com.squareup.okhttp3:okhttp:3.14.3'
+    implementation 'com.squareup.okhttp3:okhttp:3.12.5'
     implementation 'com.google.guava:guava:27.1-android'
     quicksyImplementation 'io.michaelrocks:libphonenumber-android:8.10.16'
 }