fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade: - https://snyk.io/vuln/SNYK-JS-BOOTSTRAP-173700

Author: snyk-bot

package-lock.json

@@ -18,7 +18,7 @@
  "angular": "^1.7.5",
  "angular-ui-bootstrap": "^2.5.0",
  "angular-ui-notification": "^0.3.6",
- "bootstrap": "^4.1.3",
+ "bootstrap": "^4.3.1",
  "jose": "^0.3.2",
  "jquery": "^3.3.1",
  "jsrsasign": "^8.0.7",