Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/a607968: Update devel to 20210104, commit 5a7a52eade229bc55c4883d858b36b5f6112bdb7

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20201226, devel
+Tags: devel-20210104, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 00e405a836b6baace13b565db7b1d7addd544d56
+GitCommit: a607968c661e7062380c3cbd1092a0ab81c50ae3
 Directory: devel
 
 Tags: 5.1.4, 5.1, 5, latest