Add arm64v8 for JRuby 9.3

[headius]

Ref jruby/docker-jruby#78

[github-actions]

Diff for dc33cd7:

diff --git a/_bashbrew-cat b/_bashbrew-cat
index bd59d4a..6979cc7 100644
--- a/_bashbrew-cat
+++ b/_bashbrew-cat
@@ -3,6 +3,7 @@ GitRepo: https://github.com/jruby/docker-jruby.git
 GitCommit: fae50010fae73e3cbed04c660747419413096767
 
 Tags: 9-jdk, 9-jdk8, 9.3-jdk, 9.3-jdk8, 9.3.4-jdk, 9.3.4-jdk8, 9.3.4.0-jdk, 9.3.4.0-jdk8
+Architectures: amd64, arm64v8
 Directory: 9.3/jdk8
 
 Tags: 9.2, 9.2.20, 9.2-jre, 9.2-jre8, 9.2.20-jre, 9.2.20-jre8, 9.2.20.1, 9.2.20.0-jre, 9.2.20.0-jre8
@@ -24,13 +25,17 @@ Tags: 9.2-onbuild, 9.2.20-onbuild, 9.2.20.1-onbuild
 Directory: 9.2/onbuild-jdk8
 
 Tags: 9.3-jdk11, 9.3.4-jdk11, 9.3.4.0-jdk11
+Architectures: amd64, arm64v8
 Directory: 9.3/jdk11
 
 Tags: 9.3-jdk17, 9.3.4-jdk17, 9.3.4.0-jdk17
+Architectures: amd64, arm64v8
 Directory: 9.3/jdk17
 
 Tags: 9.3-jre11, 9.3.4-jre11, 9.3.4.0-jre11
+Architectures: amd64, arm64v8
 Directory: 9.3/jre11
 
 Tags: latest, 9, 9.3, 9.3.4, 9.3-jre, 9.3-jre8, 9.3.4-jre, 9.3.4-jre8, 9.3.4.0, 9.3.4.0-jre, 9.3.4.0-jre8
+Architectures: amd64, arm64v8
 Directory: 9.3/jre8

Relevant Maintainers:

• jruby: @jruby @headius @enebo