Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/ba6a6be: Update 5.2 to 5.2.21, patch 21

library/bash

@@ -8,9 +8,9 @@ Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
 GitCommit: bd68c713fb88af7365d921de614c2783766540e8
 Directory: devel
 
-Tags: 5.2.15, 5.2, 5, latest, 5.2.15-alpine3.18, 5.2-alpine3.18, 5-alpine3.18, alpine3.18
+Tags: 5.2.21, 5.2, 5, latest, 5.2.21-alpine3.18, 5.2-alpine3.18, 5-alpine3.18, alpine3.18
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: fa56f3014aa4901e889d12910a711d1adc0fc6a6
+GitCommit: ba6a6be33e2bc2b6f045963607650e54a83a974b
 Directory: 5.2
 
 Tags: 5.1.16, 5.1, 5.1.16-alpine3.18, 5.1-alpine3.18