Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/4c47bc9: Update devel to 20210426, commit 3fd77612fca0fa1956e54aac2e61bdcfecfe3b52

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20210419, devel
+Tags: devel-20210426, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: a360295cd1a85b715da59fa8253ebb8c2147a928
+GitCommit: 4c47bc9e2c0c9c51b721f0f66e372c2202ef97bb
 Directory: devel
 
 Tags: 5.1.4, 5.1, 5, latest