Update JS dependency @testing-library/jest-dom to v5.11.8 (#8939)

Co-authored-by: Renovate Bot <[email protected]>

themes-default/slim/package.json

@@ -74,7 +74,7 @@
     "@babel/runtime": "7.12.5",
     "@mapbox/stylelint-processor-arbitrary-tags": "0.3.0",
     "@sharkykh/eslint-plugin-vue-extra": "0.1.1",
-    "@testing-library/jest-dom": "5.11.6",
+    "@testing-library/jest-dom": "5.11.8",
     "@vue/test-utils": "1.1.2",
     "babel-core": "7.0.0-bridge.0",
     "babel-loader": "8.2.2",

themes-default/slim/yarn.lock

@@ -1602,10 +1602,10 @@
     remark "^13.0.0"
     unist-util-find-all-after "^3.0.2"
 
-"@testing-library/[email protected].6":
-  version "5.11.6"
-  resolved "https://registry.yarnpkg.com/@testing-library/jest-dom/-/jest-dom-5.11.6.tgz#782940e82e5cd17bc0a36f15156ba16f3570ac81"
-  integrity sha512-cVZyUNRWwUKI0++yepYpYX7uhrP398I+tGz4zOlLVlUYnZS+Svuxv4fwLeCIy7TnBYKXUaOlQr3vopxL8ZfEnA==
+"@testing-library/[email protected].8":
+  version "5.11.8"
+  resolved "https://registry.yarnpkg.com/@testing-library/jest-dom/-/jest-dom-5.11.8.tgz#433a84d6f9a089485101b9e112ef03e5c30bcbfc"
+  integrity sha512-ScyKrWQM5xNcr79PkSewnA79CLaoxVskE+f7knTOhDD9ftZSA1Jw8mj+pneqhEu3x37ncNfW84NUr7lqK+mXjA==
   dependencies:
     "@babel/runtime" "^7.9.2"
     "@types/testing-library__jest-dom" "^5.9.1"