Update springDocVersion to v2.8.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.springdoc:springdoc-openapi-starter-webmvc-api (source)	2.8.6 -> 2.8.8
org.springdoc:springdoc-openapi-starter-common (source)	2.8.6 -> 2.8.8
org.springdoc:springdoc-openapi-starter-webmvc-ui (source)	2.8.6 -> 2.8.8

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Release Notes

springdoc/springdoc-openapi (org.springdoc:springdoc-openapi-starter-webmvc-api)

v2.8.8

Fixed

• #​2977 - Handle projects not using kotlin-reflect #​2977

v2.8.7

Added

• #​2944 - Introducing springdoc-openapi-bom project
• #​2948 - Customize Servers via application.yml
• #​2963 - Set default content type for problem details object to application/problem+jso
• #​2971 - List of value classes in Kotlin

Changed

• Upgrade swagger-ui to v5.21.0
• Upgrade swagger-core to 2.2.30
• Upgrade spring-boot to version 3.4.5
• Upgrade spring-security-oauth2-authorization-server to version 1.4.3

Fixed

• #​2947 - Unexpected warning "Appended trailing slash to static resource location"
• #​2960 - NPE when customizing group's open-api without specifying any schema
• #​2969 - fix path to register resource handler to work SwaggerIndexPageTransformer considering /webjar path prefix
• #​2964 - Cannot add custom description and example for java.time.Duration since v2.8.6
• #​2972 - @​Header(schema = @​Schema(type = "string")) generates empty or broken schema in OpenAPI output since 2.8.0
• #​2976, #​2967 - Build Failure due to Private Inner Class.

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