Roll SK Tool from a7b6f73b1117 to dfaa677fc445

https://skia.googlesource.com/buildbot.git/+log/a7b6f73b1117..dfaa677fc445

2021-07-29 jcgregorio@google.com Followup fixes from previous CL review.
2021-07-29 borenet@google.com Remove new-branch commands
2021-07-29 jcgregorio@google.com [switchboard] Ansible role copy_authorized_keys.
2021-07-29 jcgregorio@google.com [switchboard] Ansible role to load secrets.
2021-07-29 borenet@google.com [sk] Update release-branch command for SkCQ and Chrome Faster
2021-07-29 borenet@google.com [task scheduler] Workaround to trigger Buildbucket build status fix
2021-07-28 lovisolo@google.com [gold] Replace truncateWithEllipses() with infra-sk's truncate().
2021-07-28 lovisolo@google.com [gold] Delete Webpack and Karma config files.
2021-07-28 lovisolo@google.com [status] commits-table-sk.ts: Replace Gold's truncateWithEllipses with infra-sk's truncate.
2021-07-28 borenet@google.com Update go.mod with licenses
2021-07-28 rmistry@google.com [skcq] Add expo backoff to AddComment
2021-07-28 rmistry@google.com Add configurable rate-limits to go/gerrit
2021-07-27 rmistry@google.com [skcq] Retry transient errors during vm.GetVerifiers

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/sk-tool-skia
Please CC jcgregorio@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Tbr: jcgregorio@google.com
Change-Id: I4544edd12fa17efb1366d65d92e884ee1ee0bcaf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/434483
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index 5ede470..e9c7631 100644
--- a/DEPS
+++ b/DEPS
@@ -6,7 +6,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling different
   # dependencies without interference from each other.
-  'sk_tool_revision': 'git_revision:7159a93d57df49fddbf89a6345c5f92133174f2a',
+  'sk_tool_revision': 'git_revision:dfaa677fc445525353eae31b86c5d4283f6b14bf',
 }
 
 deps = {