Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/5457635: Update devel to 20200914, commit a56608bc3f1ca5be5e3a6155672cf81f14864840

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20200901, devel
+Tags: devel-20200914, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 7d80c7cc5d829b6be9e04b6b2cba98a228fb67db
+GitCommit: 54576355cdfa2bd4b2e0f68ad4a00bd4d00dd6e4
 Directory: devel
 
 Tags: 5.1-beta, 5.1-rc, rc