Update adminer

Revert to PHP 7.4

see TimWolla/docker-adminer#108
see TimWolla/docker-adminer#110

library/adminer

@@ -5,10 +5,10 @@ GitRepo: https://github.com/TimWolla/docker-adminer.git
 
 Tags: 4.8.1-standalone, 4-standalone, standalone, 4.8.1, 4, latest
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 765c6af9437e7af01a8308b1b6a95d5a5dd4a430
+GitCommit: 0f6d3781a93e274faaee2020b110b7bf701dc5da
 Directory: 4
 
 Tags: 4.8.1-fastcgi, 4-fastcgi, fastcgi
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 765c6af9437e7af01a8308b1b6a95d5a5dd4a430
+GitCommit: 0f6d3781a93e274faaee2020b110b7bf701dc5da
 Directory: 4/fastcgi