Update luci-go client

This is mainly to take
https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/1314232

Bug: 894045
Change-Id: I1d44c36232d2771ea881c8fd1ca04fdfbf596ef4
Reviewed-on: https://chromium-review.googlesource.com/c/1333093Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607578}

DEPS

@@ -408,15 +408,15 @@ deps = {
       'packages': [
         {
           'package': 'infra/tools/luci/isolate/${{platform}}',
-          'version': 'git_revision:bc125484b8513898f17bc2501ac5e95330f44a3b',
+          'version': 'git_revision:b47dd589aae9f538adeaecc096a8dd1948d08012',
         },
         {
           'package': 'infra/tools/luci/isolated/${{platform}}',
-          'version': 'git_revision:bc125484b8513898f17bc2501ac5e95330f44a3b',
+          'version': 'git_revision:b47dd589aae9f538adeaecc096a8dd1948d08012',
         },
         {
           'package': 'infra/tools/luci/swarming/${{platform}}',
-          'version': 'git_revision:bc125484b8513898f17bc2501ac5e95330f44a3b',
+          'version': 'git_revision:b47dd589aae9f538adeaecc096a8dd1948d08012',
         },
       ],
       'dep_type': 'cipd',