Bump bootstrap from 4.1.3 to 4.3.1

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 4.1.3 to 4.3.1.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v4.1.3...v4.3.1)

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

Author: dependabot[bot]

package-lock.json

@@ -14,7 +14,7 @@
     "babel-loader": "8.0.6",
     "babel-plugin-named-asset-import": "^0.3.6",
     "babel-preset-react-app": "^9.1.1",
-    "bootstrap": "4.1.3",
+    "bootstrap": "4.3.1",
     "camelcase": "^5.3.1",
     "case-sensitive-paths-webpack-plugin": "2.3.0",
     "chart.js": "^2.7.2",