Zswag

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

Small maintenance without any major functional changes:

- [x] Compatibility with GCC 13 (105)
- [x] Remove in-tree copy of cmake-conan provider by switching to FetchContent (108)

Minor feature release with various improvements:

- [x] Upgrade zserio C++ runtime to 2.11.0
- [x] Use conan to manage dependencies [101] [100]
- [x] Allow following redirects [99] ↔️
- [x] Fix README to mention need for generating code with zserio `-withReflectionCode` argument [96]

Minor feature release with various improvements:

- [x] Pre-set `x-openapi-router-controller` is now allowed [93]
- [x] Support for Python 3.10 and 3.11 [94] 🐍
- [x] Upgrade used zserio C++ runtime to v2.9.0

Minor feature release with various improvements:

- [x] Catch is now at v3.1, zserio is at v2.8.0
- [x] HttpConfig supports pickle protocol, so it may be passed to Python subprocesses. 🥒
- [x] Provide API to access OpenAPI JSON/YAML content 📜 [88]
- [x] Ignore request MIME types other than `application/x-zserio-object` and set `Accept-Encoding` header [89]
- [x] Output full request URIs, including query params, in debug log mode.