Fix Jackson integration test imports

[gwenneg]

I made a mistake while merging #5997 and now the master build is broken.

This fixes the build.

[jaikiran]

Hello @gwenneg, (not an official approver) but this looks good to me. I think since all CI checks have passed and you have commit access, I think you should merge this.

[gwenneg]

Thanks for taking a look at it @jaikiran! I'll follow your opinion since there is absolutely zero chance this PR could cause any problem to master. Well, actually it does not seem possible for me to merge without the approval of someone else with write access.

[gwenneg]

Thanks @gsmet