Fix CI validation errors

Two CI validation errors have been fixed:
* A duplcate entry has been removed from the lockfile
* `@metamask/phishing-warning` has been added to the depcheck config,
so that it knows that dependency is being used (in e2e tests)

.depcheckrc.yml

@@ -17,6 +17,7 @@ ignores:
   # used in testing + ci
   - '@metamask/auto-changelog' # invoked as `auto-changelog`
   - '@metamask/forwarder'
+  - '@metamask/phishing-warning' # statically hosted as part of some e2e tests
   - '@metamask/test-dapp'
   - '@metamask/design-tokens' # Only imported in index.css
   - '@tsconfig/node14' # required dynamically by TS, used in tsconfig.json

yarn.lock

@@ -2804,12 +2804,7 @@
     web3 "^0.20.7"
     web3-provider-engine "^16.0.3"
 
-"@metamask/design-tokens@^1.4.2":
-  version "1.4.4"
-  resolved "https://registry.yarnpkg.com/@metamask/design-tokens/-/design-tokens-1.4.4.tgz#85a80f0ba5ff34a595bd1d879dbf4219c0fbfe7a"
-  integrity sha512-OzlUv3GSBbmVlO4EcFrkK2/InxaBMH31O2ncVabJvySc/HbhpXMEm7ZtowPqxlBI05V0WdVxSv/0MZtRkbIyXA==
-
-"@metamask/design-tokens@^1.6.0":
+"@metamask/design-tokens@^1.4.2", "@metamask/design-tokens@^1.6.0":
   version "1.6.5"
   resolved "https://registry.yarnpkg.com/@metamask/design-tokens/-/design-tokens-1.6.5.tgz#e585b67f73ce301e0218d98ba89e079f7e81c412"
   integrity sha512-5eCrUHXrIivXX1xx6kwNtM9s/ejhrPYSATSniFc7YKS9z+TkCK4/n52owOBnDIbrL8W3XxQIiaaqQAM+NQad4w==