Update DevTools DEPS (trusted)

Rolling buildtools: https://chromium.googlesource.com/chromium/src/buildtools/+log/993d5b2..c603d82

Roll created at https://cr-buildbucket.appspot.com/build/8694455615908216641

Bug: none
Change-Id: I1760e4339aab5b664ed76217ee4afdba8a989da7
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7329008
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

@@ -15,7 +15,7 @@ vars = {
   'build_revision': '726ac7741fe428eff5da63e0374c66f7f25788b8',
 
   'buildtools_url': 'https://chromium.googlesource.com/chromium/src/buildtools.git',
-  'buildtools_revision': '993d5b23cd8e2319bab0ad9939bef2a6c3f23faa',
+  'buildtools_revision': 'c603d823d75e866247fb1c69094fda3dc4c34dbe',
 
   'depot_tools_url': 'https://chromium.googlesource.com/chromium/tools/depot_tools.git',
   'depot_tools_revision': '967382fdcd1477dab3a7fec8eec3e3d5368bb0fe',