Update adminer

This includes the following changes:
- Update to PHP 7.2 (TimWolla/docker-adminer@85a94a4b152d558e09830028f576de732f4931f9)
- Allow configuring the default server via environment (TimWolla/docker-adminer@58a494d7add8975552d5ab03c16560f1961bae79)

library/adminer

@@ -4,11 +4,11 @@ Maintainers: Tim Düsterhus <[email protected]> (@TimWolla)
 GitRepo: https://github.com/TimWolla/docker-adminer.git
 
 Tags: 4.3.1-standalone, 4.3-standalone, 4-standalone, standalone, 4.3.1, 4.3, 4, latest
-Architectures: amd64
-GitCommit: 73de6b9a7979ded5d2289fe015fffe81fa32e0a4
+Architectures: amd64, arm32v6, arm64v8, i386, ppc64le
+GitCommit: 58a494d7add8975552d5ab03c16560f1961bae79
 Directory: 4.3
 
 Tags: 4.3.1-fastcgi, 4.3-fastcgi, 4-fastcgi, fastcgi
-Architectures: amd64
-GitCommit: e7677ec95176973e991b063d8782876207738ce1
+Architectures: amd64, arm32v6, arm64v8, i386, ppc64le
+GitCommit: 58a494d7add8975552d5ab03c16560f1961bae79
 Directory: 4.3/fastcgi