Update dependency taskcluster-client-web to v7

package.json

@@ -63,7 +63,7 @@
     "redux": "3.7.2",
     "redux-debounce": "1.0.1",
     "redux-thunk": "2.2.0",
-    "taskcluster-client-web": "6.0.0"
+    "taskcluster-client-web": "7.0.0"
   },
   "devDependencies": {
     "angular-mocks": "1.6.10",

yarn.lock

@@ -7046,9 +7046,9 @@ tar@^4:
     safe-buffer "^5.1.1"
     yallist "^3.0.2"
 
-taskcluster-client-web@6.0.0:
-  version "6.0.0"
-  resolved "https://registry.yarnpkg.com/taskcluster-client-web/-/taskcluster-client-web-6.0.0.tgz#1464255089476b32b0ddf8986b4e04dbb3f992d7"
+taskcluster-client-web@7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/taskcluster-client-web/-/taskcluster-client-web-7.0.0.tgz#a05a4c7f629fee2f5472e499c16dedb78781ff54"
   dependencies:
     hawk "^6.0.2"
     query-string "^5.0.0"