Roll python to actually correct packages.

For bonus points, this also fixes PRESUBMIT so that it actually checks
the manifests.

TBR=bpastene@chromium.org, tandrii@chromium.org

Bug: 1032743
Change-Id: I4dac5a520e333e3c429597684a44ece83d21c5fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1960950
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index ac3fc0d..f65055e 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -100,8 +100,8 @@
   rel_file = lambda rel: input_api.os_path.join(root, rel)
   cipd_manifests = set(rel_file(input_api.os_path.join(*x)) for x in (
     ('cipd_manifest.txt',),
-    ('bootstrap', 'win', 'manifest.txt'),
-    ('bootstrap', 'win', 'manifest_bleeding_edge.txt'),
+    ('bootstrap', 'manifest.txt'),
+    ('bootstrap', 'manifest_bleeding_edge.txt'),
 
     # Also generate a file for the cipd client itself.
     ('cipd_client_version',),