[7.3.0] Generated code with dependency error in class JSON

If generating java code, the resulting JSON class has a dependency to the class com.fasterxml.jackson.databind.util.StdDateFormat even if not using jackson as a dependency

Code with error (JSON.java):
private static final StdDateFormat sdf = new StdDateFormat()
.withTimeZone(TimeZone.getTimeZone(ZoneId.systemDefault()))
.withColonInTimeZone(true);

My gradle task:

tasks.create(name: "buildClientEcm_${swagFile}", type: org.openapitools.generator.gradle.plugin.tasks.GenerateTask) {
    group = "swagger_generation"
    **generatorName = "java"**
    id = "ecm-client-generated"
    inputSpec = "$projectDir/swagger_${swagFile}.json".toString()
    outputDir = "$rootDir/ecm-client-generated-${swagFile}".toString()
    apiPackage = "it.smi.ie.ecm.client${swagSpec}"
    invokerPackage = "it.smi.ie.ecm.client${swagSpec}"
    modelPackage = "it.smi.ie.ecm.client.model${swagSpec}"
    **configOptions = [
        openApiNullable: "false"
    ]**
}

The generated build gradle dependencies:
implementation 'io.swagger:swagger-annotations:1.6.8'
implementation "com.google.code.findbugs:jsr305:3.0.2"
implementation 'com.squareup.okhttp3:okhttp:4.10.0'
implementation 'com.squareup.okhttp3:logging-interceptor:4.10.0'
implementation 'com.google.code.gson:gson:2.9.1'
implementation 'io.gsonfire:gson-fire:1.9.0'
implementation 'javax.ws.rs:jsr311-api:1.1.1'
implementation 'javax.ws.rs:javax.ws.rs-api:2.1.1'
implementation group: 'org.apache.commons', name: 'commons-lang3', version: '3.12.0'
implementation "jakarta.annotation:jakarta.annotation-api:$jakarta_annotation_version"
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.9.1'
testImplementation 'org.mockito:mockito-core:3.12.4'
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.9.1'

Bug present in 7.3.0 but not in 7.1.0

Reproduce the Java generator regression using the shown Gradle GenerateTask and inspect the generated JSON.java for the StdDateFormat reference. Compare output from generator versions 7.1.0 and 7.3.0, then verify that the generated client no longer requires an undeclared Jackson dependency.