Update to fresh version Adminer 4.x (#1900)

adminer/Dockerfile

@@ -1,7 +1,4 @@
-FROM adminer:4.3.0
-
-# Version 4.3.1 contains PostgreSQL login errors. See docs.
-# See https://sourceforge.net/p/adminer/bugs-and-features/548/
+FROM adminer:4
 
 LABEL maintainer="Patrick Artounian <partounian@gmail.com>"