fix: upgrade to bazel_features 1.21.0 for Bazel 8 rc3 support #2440
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bazel_features has a bug where it doesn't detect Bazel 8 rc3 correctly. This is
fixed in release 1.21.0.
From the discussion on bazel-contrib/bazel_features#82,
it's likely this only occurs due to the "rc" notation of the Bazel release, so an
earlier bazel_features version will probably work fine once Bazel 8 is no longer rc.