Allow to use Jackson dependency with provided scope

[mcruzdev]

I use the quarkus-openapi-generator in a Keycloak extension. Currently, it is not possible to include the quarkus-rest-client-reactive-jackson dependency without resulting in conflicts. So, I set this dependency to provided and included the dependency in the Keycloak runtime. It is more of a workaround for https://github.com/keycloak/keycloak/issues/25589 and https://github.com/keycloak/keycloak/issues/20926. Even without this issue, it could help write extensions where the Quarkus runtime already provides the required dependencies. Of course, for standalone applications, this provides no additional benefit.

Originally posted by @koplas in https://github.com/quarkiverse/quarkus-openapi-generator/discussions/618#discussioncomment-8419783

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