Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2a4caf724ac0
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23686 from ehsan/1062564

Bug 1062564 - Inline the activity options used in the dialer app in order to make it easier to automatically extract the activity arguments from the source code

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https://hg.mozilla.org/integration/gaia-central/rev/97e0c05b34a0
Author: Ehsan Akhgari <ehsan@mozilla.com>
Desc: Bug 1062564 - Inline the activity options used in the dialer app in order to make it easier to automatically extract the activity arguments from the source code; r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/db02d90fdfed
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23651 from eliperelman/bug-1061962

Bug 1061962 - Offsetting system sleep dialog to account for SHB

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https://hg.mozilla.org/integration/gaia-central/rev/68e5d31e8c1b
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1061962 - Offsetting system sleep dialog to account for SHB
Bumping manifests a=b2g-bump