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

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https://hg.mozilla.org/integration/gaia-central/rev/24249852bce3
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #15922 from mcav/stopwatch-button-sizes

Bug 951096 - [Clock] Adjust Stop/Lap buttons size and style in Stopwatch. r=jburke

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https://hg.mozilla.org/integration/gaia-central/rev/0f0cbbedf53d
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 951096 - [Clock] Adjust Stop/Lap buttons size and style in Stopwatch. r=jburke

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https://hg.mozilla.org/integration/gaia-central/rev/1616852bd36c
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #15921 from mcav/alarm-sizes

Bug 951080 - [Clock] Adjustment for setting a new or editing an alarm. r=hhuang

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https://hg.mozilla.org/integration/gaia-central/rev/c5110e29e49d
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 951080 - [Clock] Adjustment for setting a new or editing an alarm. r=hhuang
Bumping manifests a=b2g-bump