Bump vpython pin b9c4670197 -> 03693197fe.

The new version understands CIPD packages that use SHA256 as identifier. Such
packages soon will start to appear (and the old version won't be able to handle
them).

Relevant changes:
https://chromium.googlesource.com/infra/luci/luci-go/+log/9449d18..75f8e8f/cipd

R=dpranke@chromium.org, maruel@chromium.org
TBR=bsheedy@chromium.org
BUG=821194

Change-Id: Ic11a8cb822e4574f7709588dc566f15badaa12a6
Reviewed-on: https://chromium-review.googlesource.com/1152103Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578461}

chrome/test/vr/auto_bisect.py

@@ -359,10 +359,10 @@ def RunTestOnSwarming(args, unknown_args, output_dir):
     '${platform}:git_revision:e1abc57be62d198b5c2f487bfb2fa2d2eb0e867c',
 
     '.swarming_module:infra/tools/luci/vpython-native/'
-    '${platform}:git_revision:b9c4670197dcefd8762d6e509302acd3efc6e303',
+    '${platform}:git_revision:03693197fef4b7d6f2d717f99e9e616bb4f4d8a8',
 
     '.swarming_module:infra/tools/luci/vpython/'
-    '${platform}:git_revision:b9c4670197dcefd8762d6e509302acd3efc6e303',
+    '${platform}:git_revision:03693197fef4b7d6f2d717f99e9e616bb4f4d8a8',
   ]
   for package in cipd_packages:
     swarming_args.extend(['--cipd-package', package])

tools/mb/mb.py

@@ -385,9 +385,9 @@ class MetaBuildWrapper(object):
       ('infra/tools/luci/logdog/butler/${platform}',
        'git_revision:e1abc57be62d198b5c2f487bfb2fa2d2eb0e867c'),
       ('infra/tools/luci/vpython-native/${platform}',
-       'git_revision:b9c4670197dcefd8762d6e509302acd3efc6e303'),
+       'git_revision:03693197fef4b7d6f2d717f99e9e616bb4f4d8a8'),
       ('infra/tools/luci/vpython/${platform}',
-       'git_revision:b9c4670197dcefd8762d6e509302acd3efc6e303'),
+       'git_revision:03693197fef4b7d6f2d717f99e9e616bb4f4d8a8'),
     ]
     for pkg, vers in cipd_packages:
       cmd.append('--cipd-package=.swarming_module:%s:%s' % (pkg, vers))