Move IntelliJ CE/UE OSS beta and CLion OSS beta to 2021.3
Move IntelliJ CE/UE OSS beta and CLion OSS beta to 2021.3

A Bazel plugin for IntelliJ/CLion 2021.3 has been available on the beta channel for about a week. Since then, we didn't hear about any issues with the new version. Hence, also push the plugin to the stable channel.

PiperOrigin-RevId: 423046740

bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij,bazelbuild/intellij