Bump bootstrap from 4.3.1 to 4.4.0 in /arctic/static/arctic

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 4.3.1 to 4.4.0.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v4.3.1...v4.4.0)

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

arctic/static/arctic/package.json

@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "air-datepicker": "^2.2.3",
-    "bootstrap": "^4.3.1",
+    "bootstrap": "^4.4.0",
     "font-awesome": "^4.7.0",
     "iframe-resizer": "4.2.8",
     "jquery": "^3.4.1",