Verify mac-arm64 wheels for v8/.vpython spec.

vpython's default verification does not yet include this platform,
so this allows us to ensure that v8 vpython specs stay mac-arm64
compatible.

Bug: chromium:1235841
Change-Id: I0cfe369f07a786a0606f7dac13b581820c060445
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3163003
Commit-Queue: Brian Ryner <bryner@google.com>
Auto-Submit: Brian Ryner <bryner@google.com>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76856}

.vpython

@@ -24,6 +24,21 @@
 
 python_version: "2.7"
 
+# The default set of platforms vpython checks does not yet include mac-arm64.
+# Setting `verify_pep425_tag` to the list of platforms we explicitly must support
+# allows us to ensure that vpython specs stay mac-arm64-friendly
+verify_pep425_tag: [
+    {python: "cp27", abi: "cp27mu", platform: "manylinux1_x86_64"},
+    {python: "cp27", abi: "cp27mu", platform: "linux_arm64"},
+    {python: "cp27", abi: "cp27mu", platform: "linux_armv6l"},
+
+    {python: "cp27", abi: "cp27m", platform: "macosx_10_10_intel"},
+    {python: "cp27", abi: "cp27m", platform: "macosx_11_0_arm64"},
+
+    {python: "cp27", abi: "cp27m", platform: "win32"},
+    {python: "cp27", abi: "cp27m", platform: "win_amd64"}
+]
+
 # Needed by third_party/catapult/devil/devil, which is imported by
 # build/android/test_runner.py when running performance tests.
 wheel: <