Remove dependency on jackson core and annotations

jackson-core is already included in gerrit and exported in plugin API.
jackson-annotations also doesn't seem to be needed either.

Change-Id: I50f03ec8b452efba9c4275ca20b607f5a54a895a
diff --git a/BUILD b/BUILD
index 61f49bc..86334d1 100644
--- a/BUILD
+++ b/BUILD
@@ -43,8 +43,6 @@
         "@commons-codec//jar",
         "@events-broker//jar:neverlink",
         "@io-netty-all//jar",
-        "@jackson-annotations//jar",
-        "@jackson-core//jar",
         "@jackson-databind//jar",
         "@jackson-dataformat-cbor//jar",
         "@javax-xml-bind//jar",