With the Firefox update to version 91 [2], we also need to update the Gecko driver to a supported version [1]. We should update to 0.33.0 version (the latest one) which also works fine with the 91esr even it is not supported according the table.

[1] https://firefox-source-docs.mozilla.org/testing/geckodriver/Support.html
[2] https://github.com/kiegroup/droolsjbpm-build-bootstrap/pull/2253