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

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https://hg.mozilla.org/integration/gaia-2_1/rev/1fab5e027074
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #25438 from snowmantw/bug1086175-2.1

Bug 1086175 - [Flame][KK]After full flash/reset phone, first time to

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https://hg.mozilla.org/integration/gaia-2_1/rev/e3e335b5d0e6
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1086175 - [Flame][KK]After full flash/reset phone, first time to
pair bluetooth with another phone will show notification then pair
failed

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https://hg.mozilla.org/integration/gaia-2_1/rev/1a2f3a82977a
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #25479 from snowmantw/bug1084530-2.1

 Bug 1084530 - [Lockscreen] The device can fall asleep too quickly after...

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https://hg.mozilla.org/integration/gaia-2_1/rev/2bdfd42fb465
Author: Greg Weng <snowmantw@gmail.com>
Desc:  Bug 1084530 - [Lockscreen] The device can fall asleep too quickly after dialing the last digit to an emergency number
Bumping manifests a=b2g-bump