Update Java dependencies: Selenium, GitLab API, Netty, parent POM

[zbynek]

Bundles several dependency updates into one PR and resolves compatibility issues.
#1472
#1465
#1471
#1411
#1483

Testing done

CI passed

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[zbynek]

@NotMyFault thanks for restarting the CI, looks good now.

[NotMyFault]

@NotMyFault thanks for restarting the CI, looks good now.

I have to thank you for combining the PRs :)