Pyramid-openapi3

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* Fix `multipart/form-data` support, refs 225.
[am-on]

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* Update the supported version of Python to 3.12, Pyramid to 2.0.2.
Drop support for Python 3.8.
[zupo]

* Update the supported version of `openapi-core` to 0.19.0, refs 220.
Drop support for all older versions of `openapi-core`.
[miketheman, Wim-De-Clercq, zupo]

* Update Swagger UI version to 4.18.3, refs 210.
[kskarthik]

* Add support for specifying the protocol and port for getting the openapi3
spec file, fixes running behind a reverse proxy, refs 176.
[vpet98, zupo]

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* Add support for setting a prefix for auto-generated routes.
[zupo]

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* Update Swagger UI version to 4.15.3, refs 185.
[kskarthik]

* Upgrade `openapi-core dependency` to `0.16`, refs 173.

[BREAKING CHANGE] `request.openapi_validated.parameters` will now be
a dataclass instead of a dict. For example: if you wanted to get a
query parameter called `limit`:
* before: `request.openapi_validated.parameters["query"]["limit"]`
* after: `request.openapi_validated.parameters.query["limit"]`
[damonhook]

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* `request.openapi_validated` no longer breaks non-opeanpi views, refs 172.
[grinspins, zupo]

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* Remove openapi-schema-validator as a dependency, as it is already pulled in
by openapi-core.
[zupo]