Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/9f556d7: Update devel to 20210813, commit f5b32998011f7776ea8e0bc1f66cfc12f8e59b5c

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20210808, devel
+Tags: devel-20210813, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: bde9cdfbb356c446f4fee774daaf584f61cccb7a
+GitCommit: 9f556d714c5224e679c32962377bc784e880f56b
 Directory: devel
 
 Tags: 5.1.8, 5.1, 5, latest