[cipd] Update to v2.6.4.

This version was built with go1.17. Has no other significant
changes.

R=iannucci@chromium.org, chanli@chromium.org

Change-Id: Ic1b3aa1fd74f5e87b7e0429fa0f52d7989400ee3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3651160
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
Reviewed-by: Chan Li <chanli@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>

cipd_client_version

-git_revision:8e9b0c80860d00dfe951f7ea37d74e210d376c13
+git_revision:29b908616bc920e58bf384d1e47b91b6cf9188b8

cipd_client_version.digests

 # This file was generated by
 #
 #  cipd selfupdate-roll -version-file cipd_client_version \
-#      -version git_revision:8e9b0c80860d00dfe951f7ea37d74e210d376c13
+#      -version git_revision:29b908616bc920e58bf384d1e47b91b6cf9188b8
 #
 # Do not modify manually. All changes will be overwritten.
 # Use 'cipd selfupdate-roll ...' to modify.
 
-aix-ppc64       sha256  e417d57cb6b3855f57cfef71d6e214d25b171ceb0e00a3bccd3b6a1470c271b1
-linux-386       sha256  5fed5488382ac2d36215979363b6104cb4a0a18160d001c9d1b6cb7adbab402d
-linux-amd64     sha256  a976109082e8a024c40588474130e2bab6d40f8397c22d926f031c8a47574eb7
-linux-arm64     sha256  c4c96262ff5434378adfe5d7b37f8e09fb57c3b54ace1f2a41b97e5cbe9ac481
-linux-armv6l    sha256  ea63d6c40ee919802c34a8f72bc3bdd13fa246672493af8ea04bd50400ca6d09
-linux-mips64    sha256  bbcdb1c27c329eac56278cb28a6ccabbc0b56011690c96f32a106b0ad9cb5733
-linux-mips64le  sha256  233610c737070f1ed9505ee1819f1c02bca74bda32068679255a78976bd40f16
-linux-mipsle    sha256  3edb1cfa450093173559e9b3bd84f64eedf5cfb6db5b9bc438e15c3613d209c7
-linux-ppc64     sha256  62d2945fee6f0cbd9bc0a30e32785223bfe33f0c7733ecb6b64f37140ffb5387
-linux-ppc64le   sha256  02759616f2e72f54f3128e8b1c9f64d78621d806b0629abb3959a8535bbf4bc8
-linux-s390x     sha256  3901e7f550adc87ac560b21b3ea5f6278e6f76727ca9625a974e9d8ba4e616e9
-mac-amd64       sha256  d749b9177c897dd0ff0f4613c9023ca3218784e035fd8ed1b10b7fa7b80f00ed
-mac-arm64       sha256  863e4bb48000eb4ae7ada3fb8f8a54867a42b102088bff86db564ebc7c22c224
-windows-386     sha256  197e1c11fed0bd1cc629a06ef9b7e644aeedff542a1aebc7e6f8970fafa0ac84
-windows-amd64   sha256  9402b612ed12e5b2e092c1ddf03dece5e19b2f18b10b37e2869a0d3e467c62ae
+aix-ppc64       sha256  dddc34a1cc4aa3633c07369f589051161d56eca7bb790ebf25ce1655ab5e74e2
+linux-386       sha256  34c6dfac23fa6e98cd267220c7884986348e03f923a499c9dbdf00b23856bf0b
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+linux-arm64     sha256  6e8f7b3b289988450d913c43c797aaddcf2a674101461055838486a7e18e0f6c
+linux-armv6l    sha256  cfda0ac2b49dfa10a1050580ac266a41d1685828f5bbe959f7d5e27b5360d45a
+linux-mips64    sha256  d324984b83bb2393895eeb0c917666858b293b7df2c53c5872d39d7940a0d7c6
+linux-mips64le  sha256  b7e4e25344320ab48f220e798551c6ad57685386e05a8dc2b5c78055b937cf42
+linux-mipsle    sha256  e6ef4a28a1ca668944af09dd0058951a41642fe84bcacf9d102c3b1ad57c2603
+linux-ppc64     sha256  7a3d68c03175f3b363a1beee211cb57feae97cb25cf9e232533430bd572c1fec
+linux-ppc64le   sha256  83745f3232d75fc143f98f96a9f7a04763caad4ef9cbb33c6322742117920061
+linux-s390x     sha256  2bf4c5a983d1ae8187d2ed23afd906e5d70dd463afd9fb901b87ed259fb1110b
+mac-amd64       sha256  874a056140bed8c8a412d7a7d0d8189d7ae135a5292085be1eee579f2b2c95d7
+mac-arm64       sha256  cc2b67b3fc05a7cf49cd0307fc7fe3818d68cdf7a7d52b95f72ca85756095efb
+windows-386     sha256  014fc09e6480b03e63847ca817df832b73264a421add9f32838ad4bc647f33e9
+windows-amd64   sha256  4fb79f91d4f5fe7fdf00d85734d9d08a7c17a880b987b002ee4f1bdb95bb091e