Bump linkinator from 1.7.5 to 1.8.0 (twbs#29700)

Bumps [linkinator](https://github.com/JustinBeckwith/linkinator) from 1.7.5 to 1.8.0.
- [Release notes](https://github.com/JustinBeckwith/linkinator/releases)
- [Commits](JustinBeckwith/linkinator@v1.7.5...v1.8.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -115,7 +115,7 @@
     "karma-jasmine": "^2.0.1",
     "karma-jasmine-html-reporter": "^1.4.2",
     "karma-rollup-preprocessor": "^7.0.2",
-    "linkinator": "^1.7.5",
+    "linkinator": "^1.8.0",
     "node-sass": "^4.13.0",
     "nodemon": "^2.0.0",
     "npm-run-all": "^4.1.5",