Upgrade swagger-annotations 2.2.4 -> 2.2.6

[Picnic-Bot]

This PR contains the following updates:

Package	Type	Update	Change
io.swagger.core.v3:swagger-annotations	compile	patch	2.2.4 -> 2.2.6

---

Release Notes

swagger-api/swagger-core

v2.2.6

Compare Source

• fix: refs #​4290 - fixes anyof for non objects (#​4291)

v2.2.5

Compare Source

• 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)

---

• If you want to rebase/retry this PR, click this checkbox.

[Picnic-Bot]

Suggested commit message:

Upgrade swagger-annotations 2.2.4 -> 2.2.6 (#329)

See:
- https://github.com/swagger-api/swagger-core/releases/tag/v2.2.5
- https://github.com/swagger-api/swagger-core/releases/tag/v2.2.6
- https://github.com/swagger-api/swagger-core/compare/v2.2.4...v2.2.6