printing oid with %d

[Justin Pryzby]

+JsonEncodeDateTime(char *buf, Datum value, Oid typid)
...
+                       elog(ERROR, "unknown jsonb value datetime type oid %d", 
typid);

I think this should be %u.

commit cc4feded0a31d2b732d4ea68613115cb720e624e
Author: Andrew Dunstan <and...@dunslane.net>
Date:   Tue Jan 16 19:07:13 2018 -0500

    Centralize json and jsonb handling of datetime types