[cipd] Update CIPD client v2.6.7 => v2.6.8.

This adds new optional fields to -json-output:
{
  ...
  "error_code": see cipderr.go for possible values.
  "error_details": {
      "package": "package/path/or/prefix",
      "version": "instance version",
      "subdir": "installation subdir"
  }
}

R=iannucci@chromium.org, ddoman@chromium.org
BUG=1348065

Change-Id: I2a2bf01c180330f83fcf6813150ea1d4faef79c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3824200
Reviewed-by: Scott Lee <ddoman@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>

cipd_client_version

@@ -1 +1 @@
-git_revision:2fe24264d5b4585ecd16ba8e9bb582d8f4b20875
+git_revision:89ada246fcbf10f330011e4991d017332af2365b

cipd_client_version.digests

@@ -1,24 +1,24 @@
 # This file was generated by
 #
 #  cipd selfupdate-roll -version-file cipd_client_version \
-#      -version git_revision:2fe24264d5b4585ecd16ba8e9bb582d8f4b20875
+#      -version git_revision:89ada246fcbf10f330011e4991d017332af2365b
 #
 # Do not modify manually. All changes will be overwritten.
 # Use 'cipd selfupdate-roll ...' to modify.
 
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