[Security] Bump bootstrap from 4.2.1 to 4.3.1

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 4.2.1 to 4.3.1. **This update includes security fixes.**
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](https://github.com/twbs/bootstrap/compare/v4.2.1...v4.3.1)

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

package-lock.json

@@ -1466,9 +1466,9 @@
       "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24="
     },
     "bootstrap": {
-      "version": "4.2.1",
-      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-4.2.1.tgz",
-      "integrity": "sha512-tt/7vIv3Gm2mnd/WeDx36nfGGHleil0Wg8IeB7eMrVkY0fZ5iTaBisSh8oNANc2IBsCc6vCgCNTIM/IEN0+50Q=="
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-4.3.1.tgz",
+      "integrity": "sha512-rXqOmH1VilAt2DyPzluTi2blhk17bO7ef+zLLPlWvG494pDxcM234pJ8wTc/6R40UWizAIIMgxjvxZg5kmsbag=="
     },
     "brace-expansion": {
       "version": "1.1.11",

package.json

@@ -28,7 +28,7 @@
     "@types/rimraf": "^2.0.2",
     "@types/underscore": "^1.9.1",
     "animate.css": "3.7.0",
-    "bootstrap": "^4.2.1",
+    "bootstrap": "^4.3.1",
     "glob": "^7.1.4",
     "handlebars": "^4.1.2",
     "http-server": "^0.11.1",