Bump bootstrap from 4.3.1 to 4.5.3 (#645)

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 4.3.1 to 4.5.3.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v4.3.1...v4.5.3)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -35,7 +35,7 @@
     "at.js": "^1.5.4",
     "blueimp-file-upload": "^10.30.1",
     "popper.js": "1.16.1",
-    "bootstrap": "4.3.1",
+    "bootstrap": "4.5.3",
     "bootstrap-datepicker": "~1.9.0",
     "bootstrap-tokenfield": "~0.12.0",
     "crossvent": "1.5.5",