Bump react-bootstrap from 2.9.0 to 2.9.1 in /frontend (#24)

Bumps [react-bootstrap](https://github.com/react-bootstrap/react-bootstrap) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/react-bootstrap/react-bootstrap/releases)
- [Changelog](https://github.com/react-bootstrap/react-bootstrap/blob/master/CHANGELOG.md)
- [Commits](https://github.com/react-bootstrap/react-bootstrap/compare/v2.9.0...v2.9.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frontend/yarn.lock

@@ -7942,10 +7942,10 @@ react-app-polyfill@^3.0.0:
     regenerator-runtime "^0.13.9"
     whatwg-fetch "^3.6.2"
 
-react-bootstrap@^2.9.0:
-  version "2.9.0"
-  resolved "https://registry.yarnpkg.com/react-bootstrap/-/react-bootstrap-2.9.0.tgz#10493a3bb7c0429fee886f5571b195ece6c436f0"
-  integrity sha512-dGh6fGjqR9MBzPOp2KbXJznt1Zy6SWepXYUdxMT18Zu/wJ73HCU8JNZe9dfzjmVssZYsJH9N3HHE4wAtQvNz7g==
+react-bootstrap@^2.9.1:
+  version "2.9.1"
+  resolved "https://registry.yarnpkg.com/react-bootstrap/-/react-bootstrap-2.9.1.tgz#c1ab48ae2b2cfe6d5ac957c2042eb36fcafdb1d2"
+  integrity sha512-ezgmh/ARCYp18LbZEqPp0ppvy+ytCmycDORqc8vXSKYV3cer4VH7OReV8uMOoKXmYzivJTxgzGHalGrHamryHA==
   dependencies:
     "@babel/runtime" "^7.22.5"
     "@restart/hooks" "^0.4.9"