Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/32d1e8f: Update 5.1

library/bash

@@ -10,7 +10,7 @@ Directory: devel
 
 Tags: 5.1.8, 5.1, 5, latest
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: e7aec31e1427abc0124fbfc42db73786ef040c98
+GitCommit: 32d1e8f47e985d69ff5c3717b9a94113157eca57
 Directory: 5.1
 
 Tags: 5.0.18, 5.0