Add M3 processors

Library/Homebrew/extend/os/mac/hardware/cpu.rb

@@ -109,6 +109,8 @@ module Hardware
           :arm_firestorm_icestorm
         when 0xda33d83d             # ARMv8.5-A (Blizzard, Avalanche)
           :arm_blizzard_avalanche
+        when 0x8765edea             # ARMv8.6-A (Everest, Sawtooth)
+          :arm_everest_sawtooth
         else
           :dunno
         end

Library/Homebrew/test/hardware/cpu_spec.rb

@@ -28,6 +28,7 @@ describe Hardware::CPU do
         :amd_k12,
         :arm,
         :arm_blizzard_avalanche,
+        :arm_everest_sawtooth,
         :arm_firestorm_icestorm,
         :arm_hurricane_zephyr,
         :arm_lightning_thunder,