Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/d570489: Update devel to 20210412, commit fb4ddc2d2b66b776e013ddadfce86270a71c323a

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20210401, devel
+Tags: devel-20210412, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: f9fefbb47b3640c86592c011e0d208853851d98c
+GitCommit: d5704891bd1ff6050a152795a6b1ed1e306c03cc
 Directory: devel
 
 Tags: 5.1.4, 5.1, 5, latest