postgresql: security bump to version 11.1

Fixes the following security issue:

CVE-2018-16850: SQL injection in pg_upgrade and pg_dump, via CREATE TRIGGER
...  REFERENCING

For more details, see the advisory:

https://www.postgresql.org/about/news/1905/



Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>