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

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https://hg.mozilla.org/integration/gaia-central/rev/f1830710359d
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #26860 from azasypkin/bug-1105857-alert-custom-dialog

 Bug 1105857 - [Messages] User doesn't receive any notification about incoming message if native modal dialog is shown. r=schung

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https://hg.mozilla.org/integration/gaia-central/rev/15e05e3a2be4
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1105857 - [Messages] User doesn't receive any notification about incoming message if native modal dialog is shown. r=schung
Bumping manifests a=b2g-bump