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

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https://hg.mozilla.org/integration/gaia-central/rev/7bf976de32cf
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #18331 from gtorodelvalle/dialer-bug-951604-dial-pad-page-reloaded

Bug 951604 - [Dialer] Main dialer screen (keypad) visual refresh 1.5

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https://hg.mozilla.org/integration/gaia-central/rev/56302349f4db
Author: German Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 951604 - [Dialer] Main dialer screen (keypad) visual refresh 1.5
Bumping manifests a=b2g-bump