Roll Depot Tools from c07c59ddb0be to 6081b23b2980 (3 revisions)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/c07c59ddb0be..6081b23b2980

2020-07-22 gbeaty@chromium.org Modify bot_update to support setting blamelist pins.
2020-07-22 gbeaty@chromium.org Use fixed revisions in bot_update's test API output_json.
2020-07-22 cwallez@chromium.org gclient: print use_relative_hooks deprecation on stderr.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/depot-tools-chromium-autoroll
Please CC ehmaldonado@google.com,sokcevic@google.com,ajp@google.com,apolito@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/master/autoroll/README.md

Bug: chromium:1047893,chromium:1107325,chromium:1108301
Tbr: ehmaldonado@google.com,sokcevic@google.com,ajp@google.com,apolito@google.com
Change-Id: I9b0fb5713c25581b2848711c5e4d3f0eace9585a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2313537Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#790895}

DEPS

@@ -895,7 +895,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'c07c59ddb0be93cecac66bb37a60b87670d246ab',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '6081b23b29804825c28156a79c134c881430b334',
 
   'src/third_party/devtools-frontend/src':
     Var('chromium_git') + '/devtools/devtools-frontend' + '@' + Var('devtools_frontend_revision'),