[cipd] Update cipd and vpython to v2.2.3.

It is identical to previously deployed 2.2.2, except it contains a bug fix:
https://chromium-review.googlesource.com/1152364

R=iannucci@chromium.org, maruel@chromium.org
BUG=821194

Change-Id: I6c53782d7d86d0e0a9eaef79bf277f4f413d3ae9
Reviewed-on: https://chromium-review.googlesource.com/1152496Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>

cipd_client_version

-git_revision:03693197fef4b7d6f2d717f99e9e616bb4f4d8a8
+git_revision:b6cdec8586c9f8d3d728b1bc0bd4331330ba66fc

cipd_manifest.txt

@@ -12,7 +12,7 @@ $VerifiedPlatform linux-386 linux-ppc64 linux-ppc64le linux-s390x
 $VerifiedPlatform linux-arm64 linux-armv6l linux-mips64
 
 # vpython.
-infra/tools/luci/vpython/${platform} git_revision:03693197fef4b7d6f2d717f99e9e616bb4f4d8a8
+infra/tools/luci/vpython/${platform} git_revision:b6cdec8586c9f8d3d728b1bc0bd4331330ba66fc
 
 # LUCI editor
 infra/tools/luci/led/${platform} git_revision:f8fd394bd671f4cf4da8064a1ee074018c275d15