upgrade swagger-parser to latest version

[ctreatma]

This upgrades swagger-parser to the latest release. In manual testing, this upgrade restored the generator's ability to resolve external references in OpenAPI specs.

Fixes #18429

PR checklist

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• Run the following to build the project and update samples:

  ./mvnw clean package 
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  ./bin/utils/export_docs_generators.sh
  

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  Commit all changed files.
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[wing328]

thanks for the PR.

i'm looking into the gradle test issues

updating gradle to latest 7.x and 8.x didn't help as shown in #18300

i'll try to contact Gradle team to see if they can help.

[ctreatma]

Tests are still failing with this error. It could be a gradle bug but it feels like something else; note that the jackson version in the error message is 2.17.0, but this PR updates from 2.15.3 to 2.16.2. I don't know where the 2.17.0 requirement is coming from.

Test: Test method openApiGenerate should reuse configuration cache[0](8.1.1)(org.openapitools.generator.gradle.plugin.GenerateTaskConfigurationCacheTest) produced standard out/err: java.util.concurrent.ExecutionException: org.gradle.api.GradleException: Failed to create Jar file D:\a\openapi-generator\openapi-generator\modules\openapi-generator-gradle-plugin\build\tmp\test\work\.gradle-test-kit\caches\jars-9\970b4f5233619a1f72a6b180050ad4b0\jackson-core-2.17.0.jar.

[ctreatma]

Found some additional places to upgrade gradle versions and all checks are passing now. @wing328 could you take a look?

[wing328]

nice 👍

i'll take another later today

[wing328]

looks good. let's give it a try

[wing328]

saw the following in travis ci:

e: /home/travis/build/OpenAPITools/openapi-generator/modules/openapi-generator-gradle-plugin/src/main/kotlin/org/openapitools/generator/gradle/plugin/tasks/GenerateTask.kt: (746, 28): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.7.1.

full log: https://app.travis-ci.com/github/OpenAPITools/openapi-generator/builds/270381537

can you please take a look when you've time?