[JavaSpring] Should use requiredMode instead of deprecated required attribute of Schema class

[radarsh]

Description

When using spring in the recent versions of swagger-codegen-generators, we get a lot of deprecation warnings about the required attribute of the Schema class being deprecated.

/path/to/project/build/generated/sources/swagger/java/main/com/example/api/model/Info.java:57: warning: [deprecation] required() in Schema has been deprecated
  @Schema(required = true, description = "Name")

Version

1.0.60

Can you identify when the issue first appeared?

Not yet, but I'll get back to you

Language / Generator Affected

Spring (and possibly other Java based generators too)

Additional Context

Checklist

• I have searched the existing issues to avoid duplicates.
• I have included a minimal reproducible spec or configuration.
• I have clearly described the steps to reproduce the issue.
• I have specified which generator or template is affected.