build(deps-dev): update bootstrap requirement to 4.1.3 (#1043)

Updates the requirements on [bootstrap](https://github.com/twbs/bootstrap) to permit the latest version.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](https://github.com/twbs/bootstrap/commits/v4.1.3)

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

packages/stryker-html-reporter/package.json

@@ -50,7 +50,7 @@
     "@types/file-url": "~2.0.0",
     "@types/jsdom": "~11.0.2",
     "@types/node": "~6.0.113",
-    "bootstrap": "4.1.2",
+    "bootstrap": "4.1.3",
     "highlight.js": "~9.12.0",
     "jquery": "~3.3.1",
     "jsdom": "~11.12.0",