[Java][OkHttp-Gson] fix: free form query parameters for okhttp-gson

[llendi]

Fix issue #19225

[wing328]

please add a fake endpoint in modules/openapi-generator/src/test/resources/3_0/java/petstore-with-fake-endpoints-models-for-testing-okhttp-gson.yaml.

then please follow step 3 to update the samples so that CI can test the change

[llendi]

Thanks for your reply.

Added the fake endpoint, updated the mustache api and added the samples

[llendi]

Updated to make the change minimal. If anything else is missing or needs adjustment, just let me know.

[wing328]

cc @bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04) @lwlee2608 (2019/10) @martin-mfg (2023/08)

[wing328]

thanks for the fix.

let's give it a try

[wing328]

just merged.

please give it a try with the snapshot version (published in an hour or so) to confirm it's working for you.

thanks again for the PR

[llendi]

Works as intended for me. Thank you

[wing328]

FYI. Just merged #20076 to suppress the cast warning