[Security] 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. **This update includes security fixes.**
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v4.1.3...v4.3.1)

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

package.json

@@ -17,7 +17,7 @@
  "@fortawesome/fontawesome-svg-core": "^1.2.7",
  "@fortawesome/free-solid-svg-icons": "^5.4.2",
  "@fortawesome/react-fontawesome": "^0.1.3",
- "bootstrap": "^4.1.3",
+ "bootstrap": "^4.3.1",
  "cross-fetch": "^2.2.3",
  "date-fns": "^1.29.0",
  "flow-bin": "^0.85.0",

yarn.lock

@@ -1597,9 +1597,9 @@ boolbase@^1.0.0, boolbase@~1.0.0:
  version "1.0.0"
  resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
 
-bootstrap@^4.1.3:
- version "4.1.3"
- resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.1.3.tgz#0eb371af2c8448e8c210411d0cb824a6409a12be"
+bootstrap@^4.3.1:
+ version "4.3.1"
+ resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.3.1.tgz#280ca8f610504d99d7b6b4bfc4b68cec601704ac"
 
 brace-expansion@^1.1.7:
  version "1.1.8"