Swagger-core 2.2.5 released!

• feat: replace required attribute on @Schema by requiredMode (#4286)
• allow returning 3.1 schema types in 'getType' (#4285)
• Fix #4280: Building swagger-core fails on Windows (#4281)
• Add support for XmlSchema annotation during model generation (#4278)
• fix #3998 model schema enum values of jackson fields and private methods (#4168)
• #4103 Support for Jackson reference types (#4106)
• ref #3911 - gives preferred status to first mapper errors (#3940)