Bump the cpython version for bleeding_edge.

There should be no functional changes for depot_tools. However, this
version contains a fix for building Python wheels, and we're trying to
standardize on this version everywhere.

Change-Id: Ibb8259028f0c7aa39f03a75ffdedbbb5349b4fc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2927689
Auto-Submit: Brian Ryner <bryner@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>

bootstrap/manifest_bleeding_edge.txt

@@ -18,7 +18,7 @@
 $VerifiedPlatform windows-386 windows-amd64 linux-amd64 mac-amd64
 
 @Subdir python
-infra/3pp/tools/cpython/${platform} version:2@2.7.18.chromium.36
+infra/3pp/tools/cpython/${platform} version:2@2.7.18.chromium.37
 
 @Subdir python3
 infra/3pp/tools/cpython3/${platform} version:2@3.8.10.chromium.17