[BUG][kotlin-server][jaxrs-spec] Model classes don't use jakarta package when `useJakartaEe` is true

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Model classes generated with the combination of kotlin-server generator and jaxrs-spec library don't import jakarta packages when the config option useJakartaEe is set to true.

Actual result

import javax.validation.constraints.*
import javax.validation.Valid

data class CreateLocation (

    @JsonProperty("name")
    @field:Valid
    @field:NotNull
    @field:Size(min=1,max=512) val name: kotlin.String,

Expected result

import jakarta.validation.constraints.*
import jakarta.validation.Valid

data class CreateLocation (

    @JsonProperty("name")
    @field:Valid
    @field:NotNull
    @field:Size(min=1,max=512) val name: kotlin.String,

openapi-generator version

6.6.0

OpenAPI declaration file content or url

openapi: "3.0.1"
info:
  title: example
  version: "1.0"
paths:
  /locations:
    post:
      operationId: createLocation
      tags:
        - location
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateLocation'
      responses:
        '201':
          description: Success
components:
  schemas:
    CreateLocation:
      type: object
      required:
        - name
      properties:
        name:
          type: string
          nullable: false
          minLength: 1
          maxLength: 512

Generation Details

val runOpenApiCodeGenerator = tasks.register<GenerateTask>("runOpenApiCodeGenerator") {
    generatorName.set("kotlin-server")
    inputSpec.set(project.property("openapi.spec") as String)
    outputDir.set("$buildDir/openapi")
    templateDir.set("$rootDir/src/main/resources/openapi/templates")
    apiPackage.set("com.leagueapps.openapi.api")
    modelPackage.set("com.leagueapps.openapi.model")
    typeMappings.set(
        mapOf(
            "DateTime" to "LocalDateTime"
        )
    )
    importMappings.set(
        mapOf(
            "java.time.OffsetDateTime" to "java.time.LocalDateTime"
        )
    )
    configOptions.set(
        mapOf(
            "library" to "jaxrs-spec",
            "useTags" to "true",
            "interfaceOnly" to "true",
            "useCoroutines" to "true",
            "useBeanValidation" to "true",
            "dateLibrary" to "java8",
            "enumPropertyNaming" to "UPPERCASE",
            "hideGenerationTimestamp" to "true",
            "useSwaggerAnnotations" to "false",
            "returnResponse" to "true",
            "useJakartaEe" to "true"
        )
    )
    generateApiTests.set(false)
    generateModelTests.set(false)
    generateApiDocumentation.set(false)
    generateModelDocumentation.set(false)
    outputs.upToDateWhen { false }
    outputs.cacheIf { false }
}

Steps to reproduce

Related issues/PRs

Suggest a fix

I've submitted PR https://github.com/OpenAPITools/openapi-generator/pull/15618 to fix this issue.

Start by running the kotlin-server generator with the supplied OpenAPI YAML and the jaxrs-spec, useBeanValidation, and useJakartaEe options. Inspect the generated CreateLocation model imports; done means validation imports use jakarta.validation rather than javax.validation. The issue references PR #15618, so check that work before starting.