Bump bootstrap from 4.0.0 to 4.3.1

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 4.0.0 to 4.3.1.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v4.0.0...v4.3.1)

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

Author: dependabot[bot]

package.json

@@ -6,7 +6,7 @@
     "@testing-library/jest-dom": "^4.2.4",
     "@testing-library/react": "^9.3.2",
     "@testing-library/user-event": "^7.1.2",
-    "bootstrap": "4.0.0",
+    "bootstrap": "4.3.1",
     "bootstrap-social": "5.1.1",
     "font-awesome": "4.7.0",
     "react": "^16.13.1",

yarn.lock

@@ -2476,10 +2476,10 @@ bootstrap-social@5.1.1:
     bootstrap "~3"
     font-awesome "~4.7"
 
-bootstrap@4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.0.0.tgz#ceb03842c145fcc1b9b4e15da2a05656ba68469a"
-  integrity sha512-gulJE5dGFo6Q61V/whS6VM4WIyrlydXfCgkE+Gxe5hjrJ8rXLLZlALq7zq2RPhOc45PSwQpJkrTnc2KgD6cvmA==
+bootstrap@4.3.1:
+  version "4.3.1"
+  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.3.1.tgz#280ca8f610504d99d7b6b4bfc4b68cec601704ac"
+  integrity sha512-rXqOmH1VilAt2DyPzluTi2blhk17bO7ef+zLLPlWvG494pDxcM234pJ8wTc/6R40UWizAIIMgxjvxZg5kmsbag==
 
 bootstrap@~3:
   version "3.4.1"