Zswag

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.

Maintenance release with various C++ usability improvements:

- [x] Compatibility with zserio >= 2.6.0
- [x] Added `ZSWAG_BUILD_WHEELS` and `ZSWAG_KEYCHAIN_SUPPORT` compile switches
- [x] Upgraded to latest [`zserio-cmake-helper`](https://github.com/klebert-engineering/zserio-cmake-helper)

Release dedicated to turn the log message for a missing `HTTP_SETTINGS_FILE` from error to debug-level.