Bump linkinator from 1.7.2 to 1.7.3 (twbs#29687)

Bumps [linkinator](https://github.com/JustinBeckwith/linkinator) from 1.7.2 to 1.7.3.
- [Release notes](https://github.com/JustinBeckwith/linkinator/releases)
- [Commits](JustinBeckwith/linkinator@v1.7.2...v1.7.3)

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

package.json

@@ -117,7 +117,7 @@
     "karma-jasmine": "^2.0.1",
     "karma-jasmine-html-reporter": "^1.4.2",
     "karma-rollup-preprocessor": "^7.0.2",
-    "linkinator": "^1.7.2",
+    "linkinator": "^1.7.3",
     "node-sass": "^4.13.0",
     "nodemon": "^1.19.4",
     "npm-run-all": "^4.1.5",