Update python2 for bleeding_edge to a newer version.

This package version is also available for mac-arm64.

Also, update bleeding_edge to pull a native cpython3 package on
mac-arm64, to match https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2858534

Bug: 1124119
Change-Id: Ief3c44f72fddd832cd9fb1e099dfb889a492f4a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2861642Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Brian Ryner <bryner@google.com>

bootstrap/manifest_bleeding_edge.txt

@@ -18,10 +18,10 @@
 $VerifiedPlatform windows-386 windows-amd64 linux-amd64 mac-amd64
 
 @Subdir python
-infra/3pp/tools/cpython/${platform} version:2.7.17.chromium.22
+infra/3pp/tools/cpython/${platform} version:2@2.7.18.chromium.32
 
 @Subdir python3
-infra/3pp/tools/cpython3/${os}-${arch=amd64} version:2@3.8.9.chromium.14
+infra/3pp/tools/cpython3/${platform} version:2@3.8.9.chromium.14
 
 @Subdir git
 infra/3pp/tools/git/${os}-${arch} version:2@2.30.2.chromium.6