Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/28fb78b0fa5d
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #25773 from gmarty/Bug-1083775-status-bar-label-is-overlapped-with-icons-if-the-operator-text-is-long-in2.0-fix

Bug 1083775 - [System] status-bar label is overlapped with icons if the ...

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https://hg.mozilla.org/integration/gaia-2_0/rev/ce5ed2981bc9
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1083775 - [System] status-bar label is overlapped with icons if the operator text is long in 2.0
Bumping manifests a=b2g-bump