chore: bump ngx-bootstrap from 11.0.2 to 18.1.1 in /webapp

Bumps [ngx-bootstrap](https://github.com/valor-software/ngx-bootstrap) from 11.0.2 to 18.1.1.
- [Release notes](https://github.com/valor-software/ngx-bootstrap/releases)
- [Changelog](https://github.com/valor-software/ngx-bootstrap/blob/development/CHANGELOG.md)
- [Commits](valor-software/ngx-bootstrap@v11.0.2...v18.1.1)

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

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

webapp/package.json

@@ -51,7 +51,7 @@
     "lodash-es": "^4.17.21",
     "moment-locales-webpack-plugin": "^1.2.0",
     "ngrx-store-logger": "^0.2.4",
-    "ngx-bootstrap": "^11.0.2",
+    "ngx-bootstrap": "^18.1.1",
     "ngx-cookie-service": "^17.1.0",
     "odk-xform-compact-record-representation-for-sms": "^1.0.1",
     "openrosa-xpath-evaluator": "^2.0.13",