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

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https://hg.mozilla.org/integration/gaia-central/rev/28ec60b9e1eb
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #24201 from gasolin/issue-1064898

Bug 1064898 - Time picker is not displaying AM/PM for 12 hours format af..., r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/aacb637b1d30
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1064898 - Time picker is not displaying AM/PM for 12 hours format after change locale
Bumping manifests a=b2g-bump