[7.10] update geckodriver to 0.28 (#84085)#84278

Merged

dmlemeshko merged 1 commit intoelastic:7.10from dmlemeshko:backport/7.10/pr-84085

Nov 25, 2020

+5-5

Commits on Nov 24, 2020

update geckodriver to 0.28 (elastic#84085 )
dmlemeshko
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