Release 4.2.1 (2021-08-30)

See release notes for Bazel 4.2.0: https://blog.bazel.build/2021/08/18/bazel-4.2.html

Bazel 4.2.1 contains additional fixes for two issues:

• #13890: Transitions cannot read Starlark flags as @repository_name//:flag_name
• #13904: bazel cquery deps not working

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