Roll isolate client.

This picks up a change that increases checksum caching for batch_isolate.

Bug: 969162
Change-Id: Ic0df249ac7644b9d3db3dee0a13483b8eca8bdfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1955796
Auto-Submit: Erik Chen <erikchen@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722670}

DEPS

@@ -149,7 +149,7 @@ vars = {
   # luci-go CIPD package version.
   # Make sure the revision is uploaded by infra-packagers builder.
   # https://ci.chromium.org/p/infra-internal/g/infra-packagers/console
-  'luci_go': 'git_revision:7d11fd9e66407c49cb6c8546a2ae45ea993a240c',
+  'luci_go': 'git_revision:37a855b64d59b7f079c9a0e5368f2757099d14d3',
 
   # This can be overridden, e.g. with custom_vars, to build clang from HEAD
   # instead of downloading the prebuilt pinned revision.