requirements: allow depends_on arch: :arm64

Library/Homebrew/requirements/arch_requirement.rb

@@ -19,6 +19,7 @@ class ArchRequirement < Requirement
   satisfy(build_env: false) do
     case @arch
     when :x86_64 then Hardware::CPU.intel? && Hardware::CPU.is_64_bit?
+    when :arm64 then Hardware::CPU.arm? && Hardware::CPU.is_64_bit?
     when :arm, :intel, :ppc then Hardware::CPU.type == @arch
     end
   end

Library/Homebrew/test/requirements/arch_requirement_spec.rb

@@ -0,0 +1,14 @@
+# typed: false
+# frozen_string_literal: true
+
+require "requirements/arch_requirement"
+
+describe ArchRequirement do
+  subject(:requirement) { described_class.new([Hardware::CPU.type]) }
+
+  describe "#satisfied?" do
+    it "supports architecture symbols" do
+      expect(requirement).to be_satisfied
+    end
+  end
+end