Update dependency @gitlab/ui to v20.4.0

package.json

@@ -43,7 +43,7 @@
     "@babel/preset-env": "^7.10.1",
     "@gitlab/at.js": "1.5.5",
     "@gitlab/svgs": "1.158.0",
-    "@gitlab/ui": "20.3.1",
+    "@gitlab/ui": "20.4.0",
     "@gitlab/visual-review-tools": "1.6.1",
     "@rails/actioncable": "^6.0.3-1",
     "@sentry/browser": "^5.10.2",

yarn.lock

@@ -848,10 +848,10 @@
   resolved "https://registry.yarnpkg.com/@gitlab/svgs/-/svgs-1.158.0.tgz#300d416184a2b0e05f15a96547f726e1825b08a1"
   integrity sha512-5OJl+7TsXN9PJhY6/uwi+mTwmDZa9n/6119rf77orQ/joFYUypaYhBmy/1TcKVPsy5Zs6KCxE1kmGsfoXc1TYA==
 
-"@gitlab/ui@20.3.1":
-  version "20.3.1"
-  resolved "https://registry.yarnpkg.com/@gitlab/ui/-/ui-20.3.1.tgz#4f29f9c16b34303074228081264415c3cd1e04de"
-  integrity sha512-CwxTKzvyVU4s25RCcfa4NBSxnRqQ/zHrYsAyBOJdK7uTDcuoPh6UqvXw4U0ghyIExRtTsF9GCWQJNYxcRT6p/g==
+"@gitlab/ui@20.4.0":
+  version "20.4.0"
+  resolved "https://registry.yarnpkg.com/@gitlab/ui/-/ui-20.4.0.tgz#ea5195b181f56312ede55e89c444805594adedbb"
+  integrity sha512-QLxj0a2iRDuSvAdvgZf8KtpUg8Bt8jSQbupCdiiohSp73LidRB4aZv0b/TTb6sxpmhKRaKSx9uqHrpHXtymGyw==
   dependencies:
     "@babel/standalone" "^7.0.0"
     "@gitlab/vue-toasted" "^1.3.0"