Zswag

What's Changed
* Treat HTTP 204 as error by fklebert in https://github.com/ndsev/zswag/pull/120 (#115)


**Full Changelog**: https://github.com/ndsev/zswag/compare/v1.6.6...v1.6.7

**Full Changelog**: https://github.com/ndsev/zswag/compare/v1.6.5...v1.6.6

What's Changed
* Update zserio and httplib by fklebert in https://github.com/ndsev/zswag/pull/117
* Guard spdlog find_package to enable external users to not use conan by fklebert in https://github.com/ndsev/zswag/pull/119


**Full Changelog**: https://github.com/ndsev/zswag/compare/v1.6.4...v1.6.5

This release is dedicated to upgrading the openssl dependency to version 3.2.0 and httplib to 0.15.0.

Another small maintenance and feature release:

* Critical dependency maintenance changes (connexion version pin 110 ), zserio 2.12 upgrade
* A minor new feature: HTTP code 400 is returned for malformed requests (109 )

Small maintenance release:

- [x] Move to Catch2 v3.4