npm-dep: bump bootstrap from 5.3.0 to 5.3.1 in /frontend

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 5.3.0 to 5.3.1.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](https://github.com/twbs/bootstrap/compare/v5.3.0...v5.3.1)

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

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

frontend/package.json

@@ -55,7 +55,7 @@
     "dependencies": {
         "@fortawesome/free-solid-svg-icons": "^6.4.0",
         "@popperjs/core": "^2.11.8",
-        "bootstrap": "5.3.0",
+        "bootstrap": "5.3.1",
         "date-fns": "^2.30.0",
         "pocketbase": "^0.15.3",
         "sass": "^1.64.1",