fix(deps): update springdoc-openapi.version to v2.8.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
org.springdoc:springdoc-openapi-starter-webflux-ui (source)	compile	minor	2.7.0 -> 2.8.1
org.springdoc:springdoc-openapi-starter-webmvc-ui (source)	compile	minor	2.7.0 -> 2.8.1

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Release Notes

springdoc/springdoc-openapi (org.springdoc:springdoc-openapi-starter-webflux-ui)

v2.8.1

Fixed

• #​2834 - java.lang.ClassNotFoundException: kotlin.reflect.full.KClasses when upgrade from 2.7.0 to 2.8.0

v2.8.0

Added

• #​2790 - Moving to OpenAPI 3.1 as the default implementation for springdoc-openapi
• #​2817 - Obey annotations when flattening ParameterObject fields
• #​2826 - Make it possible to mark parameters with @​RequestParam annotation to be sent in form instead of query.
• #​2822 - Support returning null in ParameterCustomizer
• #​2830 - Add support for deprecated fields.
• #​2780 - Add Security Schema by AutoConfigure

Changed

• Upgrade spring-boot to 3.4.1
• Upgrade spring-cloud-function to 4.2.0
• Upgrade swagger-core to 2.2.27

Fixed

• #​2804 - Stable release 2.7.0 depends on Spring Cloud Milestone 4.2.0-M1
• #​2828 - Required a bean of type 'org.springframework.data.rest.webmvc.mapping.Associations' that could not be found.
• #​2823 - Capturing pattern in identical paths only renders the path element of one method
• #​2817 - Automatically add required if a field is @​notNull or @​NotBlank.
• #​2814 - An unresolvable circular reference with management.endpoint.gateway.enabled=true.
• #​2798 - Object schema generated for Unit Kotlin type.
• #​2797 - Removing operationId via customizer does not work anymore.
• #​2833 - Resolve infinite recursion and add example test with OpenAPI v3.1
• #​2827 - Ignoring @​Parameter(required = false)

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[simonhir]

Only relevant point which was discovered during review:
OpenAPI-Spec generated is upgraded from 3.0 to 3.1

In general this shouldn't be a problem, because the openapi-generator-maven-plugin supports 3.x and it's already available since 2021
See https://www.openapis.org/blog/2021/02/16/migrating-from-openapi-3-0-to-3-1-0 for more details