Bump base64-bytestring limit to 1.3 (#1382)

Author: Philonous

servant-server/servant-server.cabal

@@ -78,7 +78,7 @@ library
   -- Here can be exceptions if we really need features from the newer versions.
   build-depends:
       base-compat         >= 0.10.5   && < 0.12
-    , base64-bytestring   >= 1.0.0.1  && < 1.2
+    , base64-bytestring   >= 1.0.0.1  && < 1.3
     , exceptions          >= 0.10.0   && < 0.11
     , http-media          >= 0.7.1.3  && < 0.9
     , http-types          >= 0.12.2   && < 0.13