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

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https://hg.mozilla.org/integration/gaia-central/rev/2ff3ccd1570e
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #26297 from gmarty/Bug-1095142-Dialer-screen-does-not-fully-cover-lockscreen

Bug 1095142 - [SHB] Dialer screen does not fully cover lockscreen

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https://hg.mozilla.org/integration/gaia-central/rev/1659acfd8ad4
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1095142 - [SHB] Dialer screen does not fully cover lockscreen
Bumping manifests a=b2g-bump