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

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https://hg.mozilla.org/integration/gaia-2_1/rev/bbab72ea969b
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25696 from azasypkin/v2.1-bug-1092112-deletion-waiting-screen

Bug 1092112 - [Messages] Waiting screen never disappears if user confirms thread deletion when there is not any selected thread. r=schung

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https://hg.mozilla.org/integration/gaia-2_1/rev/74ed6db3646f
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1092112 - [Messages] Waiting screen never disappears if user confirms thread deletion when there is not any selected thread. r=schung
Bumping manifests a=b2g-bump