test: Pin guava version to avoid dependency clash

[mcollovati]

Description

Quarkus bom explicitly defines a dependency on guava but that version clasehs with the one required by the selenium version used by vaadin testbench.

Type of change

• [ ] Bugfix
• [ ] Feature

Checklist

• [X] I have read the contribution guide: https://vaadin.com/docs/latest/guide/contributing/overview/
• [X] I have added a description following the guideline.
• [ ] The issue is created in the corresponding repository and I have referenced it.
• [ ] I have added tests to ensure my change is effective and works as intended.
• [X] New and existing tests are passing locally with my change.
• [X] I have performed self-review and corrected misspellings.

Additional for Feature type of change

• [ ] Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[caalador]

If you could add a note about this issue of testbench with quarkus to the documentation it would be great: https://github.com/vaadin/docs/blob/latest/articles/flow/integrations/quarkus.asciidoc

[mcollovati]

If you could add a note about this issue of testbench with quarkus to the documentation it would be great: https://github.com/vaadin/docs/blob/latest/articles/flow/integrations/quarkus.asciidoc

Will do. Should it go to "Limitations" paragraph or its better add a "Know issues"?

[caalador]

Perhaps add a new Known Issues paragraph there.