[roll] Roll CIPD client and vpython to versions that use v2 cipd protocol.

It is already used on all bots. Soon (next week) older clients will be able only
to do 'cipd ensure' and  self-update. Everything else will require v2 client or
newer.

Change-Id: Ib76757120a8fa1fb40b50d26487ec17d886d890f
diff --git a/.cipd_version b/.cipd_version
index 3907ecc..7e5e6d1 100644
--- a/.cipd_version
+++ b/.cipd_version
@@ -1 +1 @@
-git_revision:aacec5af4d569cee51437a89425db0b3c3d39a0a
+git_revision:b9c4670197dcefd8762d6e509302acd3efc6e303
diff --git a/fuchsia.ensure b/fuchsia.ensure
index a75a824..a8f8235 100644
--- a/fuchsia.ensure
+++ b/fuchsia.ensure
@@ -6,7 +6,7 @@
 $VerifiedPlatform mac-amd64
 
 # vpython
-infra/tools/luci/vpython/${platform} git_revision:4fdf96945cb39cddf6e37f11c07acb9877557408
+infra/tools/luci/vpython/${platform} git_revision:b9c4670197dcefd8762d6e509302acd3efc6e303
 
 # LUCI editor
 infra/tools/luci/led/${platform} git_revision:4fdf96945cb39cddf6e37f11c07acb9877557408