Replace Springfox by Springdoc

Springfox was replaced by Springdoc. This change is considered breaking. Customers using custom Spring controllers might have to update their annotations as described in the Springdoc migration guide: https://springdoc.org/v1/#migrating-from-springfox. The swagger documentation is still accessed the same way as before.

Follow Section, “Replace Springfox by Springdoc” for upgrade information.

(CMS-23463)

Updated caption property of CMMedia to standard rich text pattern

The property 'caption' in type CMMedia still was of type 'string' and contains CoreMedia richt text grammar. As all other rich text properties were updated already to a new standard pattern, this was also updated for 'caption' also. Although this change is marked breaking, for most cases this change is most likely non-breaking, as this property is a non used property in Studio (blueprint-doctypes). Unless custom changes are making use of the property 'caption', this change may be considered non-breaking.

(CMS-22179)