Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/bde9cdf: Update devel to 20210808, commit 4d4294caf728fb32307c506cb18afc90d4b70afa

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20210802, devel
+Tags: devel-20210808, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 834aebef6aa02a19254bc39727950e0891f18f62
+GitCommit: bde9cdfbb356c446f4fee774daaf584f61cccb7a
 Directory: devel
 
 Tags: 5.1.8, 5.1, 5, latest