fix: updated swagger-ui to v5.18.1 (#2378)

## Description

This PR updates the
[swagger-ui](https://github.com/swagger-api/swagger-ui) to latest
version (5.18.1).

Provided version of swagger-ui cannot render recursive objects properly
(they are rendered as empty objects). This bug was resolved in v5.11.8
(more context can be found here:
swagger-api/swagger-ui#3325).

I have tested this update in our projects and it seems to be OK 🤞.

Cheers!

## What type of PR is this? (check all applicable)
- [x] Bug Fix
- [ ] Feature
- [ ] Refactor
- [ ] Deprecation
- [ ] Breaking Change
- [ ] Documentation Update
- [ ] CI

## Checklist
- [ ] I have made corresponding changes to the documentation (`docs/`)
- [ ] I have made corresponding changes to the changelog
(`CHANGELOG.md`)