Fix test for ARM

Library/Homebrew/test/utils/bottles/bottles_spec.rb

@@ -5,9 +5,13 @@ require "utils/bottles"
 
 describe Utils::Bottles do
   describe "#tag", :needs_macos do
-    it "returns :catalina on Catalina" do
-      allow(MacOS).to receive(:version).and_return(MacOS::Version.new("10.15"))
-      expect(described_class.tag).to eq(:catalina)
+    it "returns :big_sur or :arm64_big_sur on Big Sur" do
+      allow(MacOS).to receive(:version).and_return(MacOS::Version.new("11.0"))
+      if Hardware::CPU.intel?
+        expect(described_class.tag).to eq(:big_sur)
+      else
+        expect(described_class.tag).to eq(:arm64_big_sur)
+      end
     end
   end
 end