Weird test failures related to puppeteer (mdn#3696)

* Weird test failures related to puppeteer

Fixes mdn#3694

* tell dependabot to not upgrade puppeteer 9.x automatically

* specific about 9.1.x

.github/dependabot.yml

@@ -40,3 +40,12 @@ updates:
       prefix: build
       prefix-development: chore
       include: scope
+
+    ignore:
+      # In https://github.com/mdn/yari/issues/3694 we discovered that
+      # installing puppeteer 9.1.0 seems to have made the tests flaky
+      # when jest starts up. See the issue for more detail.
+      # After this, we can keep an eye on puppeteer to see if the tests
+      # get better later with new versions.
+      - dependency-name: "puppeteer"
+        versions: ["9.1.x"]

package.json

@@ -144,7 +144,7 @@
     "prettier": "2.2.1",
     "prettier-plugin-packagejson": "^2.2.10",
     "pretty-quick": "3.1.0",
-    "puppeteer": "9.1.0",
+    "puppeteer": "9.0.0",
     "react": "17.0.2",
     "react-dom": "17.0.2",
     "react-is": "^17.0.2",

yarn.lock

@@ -15978,10 +15978,10 @@ pupa@^2.0.1:
   dependencies:
     escape-goat "^2.0.0"
 
-puppeteer@9.1.0:
-  version "9.1.0"
-  resolved "https://registry.yarnpkg.com/puppeteer/-/puppeteer-9.1.0.tgz#0530ed1f595088eefd078c8f1f7618d00f216a56"
-  integrity sha512-+BWwEKYQ9oBTUcDYwfgnVPlHSEYqD4sXsMqQf70vSlTE6YIuXujc7zKgO3FyZNJYVrdrUppy/LLwGF1IRacQMQ==
+puppeteer@9.0.0:
+  version "9.0.0"
+  resolved "https://registry.yarnpkg.com/puppeteer/-/puppeteer-9.0.0.tgz#b476e17ceb3e33a6667bf682d66dde9898f9c031"
+  integrity sha512-Avu8SKWQRC1JKNMgfpH7d4KzzHOL/A65jRYrjNU46hxnOYGwqe4zZp/JW8qulaH0Pnbm5qyO3EbSKvqBUlfvkg==
   dependencies:
     debug "^4.1.0"
     devtools-protocol "0.0.869402"