Bump bootstrap from 3.3.7 to 5.0.0

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 3.3.7 to 5.0.0.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v3.3.7...v5.0.0)

---
updated-dependencies:
- dependency-name: bootstrap
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -18,7 +18,7 @@
   "homepage": "https://github.com/GFDRR/thinkhazard",
   "dependencies": {
     "bootlint": "~0.11.0",
-    "bootstrap": "3.3.7",
+    "bootstrap": "5.0.0",
     "jquery": "~3.3.1",
     "jshint": "~2.5.1",
     "leaflet": "~0.7.7",