mac-arm64: Update to Xcode 12.2b2 (12B5025f)

CQ-Include-Trybots: luci.chromium.try:mac-arm64-rel
Change-Id: I44846fc87f64808df1bf0baeb107f22c46b46771
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439420
Auto-Submit: Mark Mentovai <mark@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812091}

build/mac_toolchain.py

@@ -34,9 +34,9 @@ MAC_BINARIES_TAG = {
     # This contains binaries from Xcode 11.2.1, along with the 10.15 SDKs (aka
     # 11B53).
     'default': 'wXywrnOhzFxwLYlwO62UzRxVCjnu6DoSI2D2jrCd00gC',
-    # This contains binaries from Xcode 12.2 beta, along with the
-    # 11 SDK (aka 12B5018i).
-    'xcode_12_beta': 'WYCYb9qqIJtWJk4y23RGbsd7FLJPflS6weNRH3DnNLkC',
+    # This contains binaries from Xcode 12.2 beta 2, along with the
+    # 11 SDK (aka 12B5025f).
+    'xcode_12_beta': '8BjeNPCdtYPajEJ0cPZXG5ATuuBCHPTBfYEuGrdE5KcC',
 }
 
 # The toolchain will not be downloaded if the minimum OS version is not met.