Bump Retrofit version to 3.0.0.

Author: dbrant

gradle/libs.versions.toml

@@ -40,7 +40,7 @@ paletteKtx = "1.0.0"
 photoview = "1.0.3"
 preferenceKtx = "1.2.1"
 recyclerview = "1.4.0"
-retrofitVersion = "2.11.0"
+retrofitVersion = "3.0.0"
 robolectric = "4.16"
 roomVersion = "2.8.1"
 swiperefreshlayout = "1.1.0"