Update to 2.6.16

https://crrev.com/c/5085067 introduced `describe` outputting metadata
to the CLI.

Bug: https://crbug.com/1506737

Change-Id: I2567e90da6e0a20437c081099364bd56bc6646d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5161009
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Chris Lewis <cflewis@google.com>

cipd_client_version

@@ -1 +1 @@
-git_revision:6e9be28a4c4e3a804f400dc6c2ed08b866f0a38b
+git_revision:200dbdf0e967e81388359d3f85f095d39b35db67

cipd_client_version.digests

@@ -1,25 +1,41 @@
 # This file was generated by
 #
 #  cipd selfupdate-roll -version-file cipd_client_version \
-#      -version git_revision:6e9be28a4c4e3a804f400dc6c2ed08b866f0a38b
+#      -version git_revision:200dbdf0e967e81388359d3f85f095d39b35db67
 #
 # Do not modify manually. All changes will be overwritten.
 # Use 'cipd selfupdate-roll ...' to modify.
 
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