Update bash

[tianon]

Changes:

• tianon/docker-bash@59513cc: Update to 5.1-beta, patch level 0

[github-actions]

Diff for b9c3780:

diff --git a/_bashbrew-cat b/_bashbrew-cat
index d29653d..6e00668 100644
--- a/_bashbrew-cat
+++ b/_bashbrew-cat
@@ -46,9 +46,9 @@ Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
 GitCommit: 8d5bcd5f1a8a84662fa34ba674282a7fc7451965
 Directory: 5.0
 
-Tags: 5.1-alpha, 5.1-rc, rc
+Tags: 5.1-beta, 5.1-rc, rc
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: b8b5f6e00e8bb60586183a6788000302c68f04fb
+GitCommit: 59513ccf13a99b69d25e794339e82dee4eb6f93b
 Directory: 5.1-rc
 
 Tags: devel-20200901, devel
diff --git a/_bashbrew-list b/_bashbrew-list
index ffb95ba..1096510 100644
--- a/_bashbrew-list
+++ b/_bashbrew-list
@@ -19,7 +19,7 @@ bash:4.4.23
 bash:5
 bash:5.0
 bash:5.0.18
-bash:5.1-alpha
+bash:5.1-beta
 bash:5.1-rc
 bash:devel
 bash:devel-20200901
diff --git a/bash_rc/Dockerfile b/bash_rc/Dockerfile
index a52d52a..17e9d7c 100644
--- a/bash_rc/Dockerfile
+++ b/bash_rc/Dockerfile
@@ -4,7 +4,7 @@ FROM alpine:3.12
 ENV _BASH_GPG_KEY 7C0135FB088AAF6C66C650B9BB5869F064EA74AB
 
 # https://ftp.gnu.org/gnu/bash/?C=M;O=D
-ENV _BASH_VERSION 5.1-alpha
+ENV _BASH_VERSION 5.1-beta
 ENV _BASH_PATCH_LEVEL 0
 # https://ftp.gnu.org/gnu/bash/bash-5.0-patches/?C=M;O=D
 ENV _BASH_LATEST_PATCH 0