Update dependency org.springdoc:springdoc-openapi-ui to v1.6.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.springdoc:springdoc-openapi-ui (source)	1.6.7 -> 1.6.8

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Release Notes

springdoc/springdoc-openapi

### [`v1.6.8`](https://togithub.com/springdoc/springdoc-openapi/blob/HEAD/CHANGELOG.md#​168---2022-04-22) ##### Added - [#​1616](https://togithub.com/springdoc/springdoc-openapi/issues/1616) - Add global customizer and filters - [#​1620](https://togithub.com/springdoc/springdoc-openapi/issues/1620) - Allow ComposedSchemas to replace non-composed so we can respect polymorphic links discovered in later methods - [#​1579](https://togithub.com/springdoc/springdoc-openapi/issues/1579) - Updated class and method javadoc handling ##### Changed - upgrade to spring-boot 2.6.7 - [#​1603](https://togithub.com/springdoc/springdoc-openapi/issues/1603) - Update swagger-ui path from /swaggerui to /swagger-ui when using management port (actuator) . - Prefer ComposedSchemas over non-composed so that method name order doesn't prevent polymorphic links generating into the spec ##### Fixed - [#​1621](https://togithub.com/springdoc/springdoc-openapi/issues/1621) - Redirection to UI broken with query-config-enabled when any other boolean parameter is defined. - [#​1617](https://togithub.com/springdoc/springdoc-openapi/issues/1617) - spring cloud stream crashes at startup. - [#​1605](https://togithub.com/springdoc/springdoc-openapi/issues/1605) - spring-native NullPointerException due to missing TypeHint

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