Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/abcb391: Update devel to 20210510, commit b304aabc92d3f8f2a4f6ebbc35fa4614bbb83ea8

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20210430, devel
+Tags: devel-20210510, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: b013a29363088c8cb9da6dcd03e2315859e384dc
+GitCommit: abcb39177bed7bad5b0c5f86bc553180e88cae0b
 Directory: devel
 
 Tags: 5.1.8, 5.1, 5, latest