* upgrade spring-boot-starter-parent
* upgrade springdoc and swagger-ui
* upgrade v3 swagger-annotations
* generate samples
* upgrade jackson
* fix spring cloud, remove temp comment
Putting "8" instead of "1.8" should be ok, because Spring Boot 3 requires Java 17 anyway, so it should be able to understand that 8 is the same as 1.8.
* generate samples
* upgrade JUnit 5, remove commons-io dependency, remove outdated samples/client/petstore/java/feign/feign10x/ files, generate samples
commons-io dependency was introduced in https://github.com/OpenAPITools/openapi-generator/pull/8484, but I don't see why it would be needed now or back then.
* update gson, generate samples
* update logback
* update feign
* update scribejava
* generate samples
* update httpmime
* okhttp-gson: update commons-lang & okhttp & junit-platform, remove mockito; generate samples
It seems Mockito is not used at all there.
* okhttp-gson: remove unnecessary sample files, generate sample files
* upgrade google-api-client & jersey-common, restore ClientTest, generate samples
* misc. upgrades in jersey2 and jersey3
jersey 3.1.3 is available already, but IntelliJ reports security problems in 3.1.3 and 3.1.2, so I used 3.1.1 instead.
* align some gradle&sbt files with poms, generate samples
* whitespace fix
This utility class has been marked as deprecated for future removal since Spring 6.0.5. All Java generators, except WebClient and RestTemplate, are already using Base64 directly.
