Update DevTools DEPS (trusted)

Rolling third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/e5159ab..f638e8a

Roll created at https://cr-buildbucket.appspot.com/build/8721781927749332305

Bug: none
Change-Id: I358e01225e6b0246781ac34a3643dd696079d5f4
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6307393
Commit-Queue: Devtools Autoroller <devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Devtools Autoroller <devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>

Author: devtools-ci-autoroll-builder

DEPS

@@ -18,7 +18,7 @@ vars = {
   'buildtools_revision': 'b248db940ef3dd7e5f4694ebf4d8a3f67aa0086d',
 
   'depot_tools_url': 'https://chromium.googlesource.com/chromium/tools/depot_tools.git',
-  'depot_tools_revision': 'e5159abea6bc8d185535c4439144b277f3163ca0',
+  'depot_tools_revision': 'f638e8a918fb4e4c26ea3be77fdf398949404358',
 
   'inspector_protocol_url': 'https://chromium.googlesource.com/deps/inspector_protocol',
   'inspector_protocol_revision': '940abfc668be2591483f7132145593c6a047f3cf',