Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/9aa0b47: Update to commit 9a53e2aa75322ac40fb4211eb5a7ad7baf1f7c93

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20190719, devel
+Tags: devel-20190725, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 455f78047f1e0d59170f68ff0caeebc3762437ea
+GitCommit: 9aa0b472a192d5cf9b35958d3f07b2459efbe357
 Directory: devel
 
 Tags: 5.0.7, 5.0, 5, latest