Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/0759ef0: Update to commit 51f1f17b4aca9949dc8f364e85d569ecdbfc8dba
- https://github.com/tianon/docker-bash/commit/21813d0: Update to commit dd4e3abc5cd4f52ac9ed5fdee41b16c26165801e

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20200622, devel
+Tags: devel-20200630, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: def174657a53d9b3e93d02f9f1dd884d08ba52f4
+GitCommit: 0759ef04b75a2b1ed707e3684c63c11b195c1878
 Directory: devel
 
 Tags: 5.1-alpha, 5.1-rc, rc