[cipd] Update cipd client to v2.6.2.

To pick up
https://chromium.googlesource.com/infra/luci/luci-go/+/df34c731

Without it CIPD deletes the current working directory when running
`cipd ensure -root <a-read-only-directory> ...` without
CIPD_CACHE_DIR set. Oops.

R=tandrii@chromium.org, iannucci@chromium.org
BUG=b/197679760

Change-Id: I8b2dfb8795d1ad4b46484c7baca520b03acc94e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3119606Reviewed-by: Andrii Shyshkalov <tandrii@google.com>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>

cipd_client_version

-git_revision:9464003f070813371070f9b8f7c350d87619d145
+git_revision:8e9b0c80860d00dfe951f7ea37d74e210d376c13

cipd_client_version.digests

 # This file was generated by
 #
 #  cipd selfupdate-roll -version-file cipd_client_version \
-#      -version git_revision:9464003f070813371070f9b8f7c350d87619d145
+#      -version git_revision:8e9b0c80860d00dfe951f7ea37d74e210d376c13
 #
 # Do not modify manually. All changes will be overwritten.
 # Use 'cipd selfupdate-roll ...' to modify.
 
-aix-ppc64       sha256  914509cdd3344c7cfcd97760df9f570fe87e67acce4443ba2e1bc08cb78d8445
-linux-386       sha256  3072edf8d50c2dec4696aa3237f7c792ef77d25d82abdbae0228629e5ce69959
-linux-amd64     sha256  b6594dc46f18f0d043d3ed252e6c163d2f75d85f89734f73ff3c900f5e0e3400
-linux-arm64     sha256  844f342ba2c910a81bb75a8f35f24f683ea12604d4945375d9692b744c35c913
-linux-armv6l    sha256  c963c0c15e43e358013c9d7eb8638a73f8eb816f418ba1c765ababc875dadd1b
-linux-mips64    sha256  61304277fb1bb7b754130ce9d94e8287bc1f721a6437b3f93195dce2d979ec81
-linux-mips64le  sha256  274be3ac553cbd9d44855c0bd57b38979a8804eb005e9b03cad607044564b6dd
-linux-mipsle    sha256  74adba38b8db3d23c30543a6f321a4d6d099e9de1f31f1872878fa49c18f4fd3
-linux-ppc64     sha256  34fb407c83b9b50ff67eb288d67bb56185868bdbd9755d7cc00902a4554beb1b
-linux-ppc64le   sha256  499031fe3e580db0b548c25b4bd85b1247ce51bd7e4ca0d7c37315c7e9384e4f
-linux-s390x     sha256  d393de13d8f3262de5bfba00e131ca5fdd19728627841ce7c306fdd383d63ff0
-mac-amd64       sha256  e4b385403c0e1a086cc2d2d6c343520b8a7d1f54a716f4e4caa17ca1d26db819
-mac-arm64       sha256  937fc82befa29c1ac40165a471b1df3a1a93cbf2d30afcd8ef3b7450b6e331f4
-windows-386     sha256  891820a8a4349b32ae1f2973e7832678e4410f511a43dc75ebf9f2b89f51d24b
-windows-amd64   sha256  6154d610eba66d200ceae7ad206ee5b7671618e76357f306eba5cf7f3f871420
+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