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

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https://hg.mozilla.org/integration/gaia-central/rev/a526a0b4cd49
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #24362 from snowmantw/issue1069132

Bug 1069132 - [Lockscreen] Newer notifications are not actionable when usic player widget is on with 320x480 devices

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https://hg.mozilla.org/integration/gaia-central/rev/ccab8ab0e515
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1069132 - [Lockscreen] Newer notifications are not actionable when music player widget is on with 320x480 devices
Bumping manifests a=b2g-bump