Update okhttp to match ExoPlayer

app/build.gradle

@@ -47,7 +47,7 @@ ext {
     exoPlayerLibVersion = '2.10.5'
     roomDbLibVersion = '2.1.0'
     leakCanaryLibVersion = '1.5.4' //1.6.1
-    okHttpLibVersion = '3.12.1'
+    okHttpLibVersion = '3.12.5' //3.12.6
     icepickLibVersion = '3.2.0'
     stethoLibVersion = '1.5.0'
 }