Added support to get okhttp library version from rootProject

Author: chaits98

android/build.gradle

@@ -41,8 +41,8 @@ android {
 
 dependencies {
     implementation "com.facebook.react:react-native:${safeExtGet('reactNativeVersion', '+')}"
-    implementation 'com.squareup.okhttp3:okhttp:+'
-    implementation 'com.squareup.okhttp3:logging-interceptor:+'
-    implementation 'com.squareup.okhttp3:okhttp-urlconnection:+'
+    implementation "com.squareup.okhttp3:okhttp:${safeExtGet('okhttp', '+')}"
+    implementation "com.squareup.okhttp3:logging-interceptor:${safeExtGet('okhttp', '+')}"
+    implementation "com.squareup.okhttp3:okhttp-urlconnection:${safeExtGet('okhttp', '+')}"
 //    {RNFetchBlob_PRE_0.28_DEPDENDENCY}
 }