build(deps): bump bootstrap from 5.2.2 to 5.3.8 in /app

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 5.2.2 to 5.3.8.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](https://github.com/twbs/bootstrap/compare/v5.2.2...v5.3.8)

---
updated-dependencies:
- dependency-name: bootstrap
  dependency-version: 5.3.8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

app/package.json

@@ -1,7 +1,7 @@
 {
   "dependencies": {
     "@fortawesome/fontawesome-free": "^6.7.2",
-    "bootstrap": "5.2.2",
+    "bootstrap": "5.3.8",
     "bootstrap-icons": "1.9.1",
     "jquery": "3.6.0",
     "marked": "^4.3.0"