Add jdk21 repositories and register toolchains for `linux_ppc64le`, `linux_s390x`, and `windows_arm64`

Closes https://github.com/bazelbuild/rules_java/pull/176

PiperOrigin-RevId: 616133820
Change-Id: Ic617f5e298a560a4f2769cc748f483434e471929
2 files changed