Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/47390a8d30a2
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1068030 - Time format is not set to a proper default locale value

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https://hg.mozilla.org/integration/gaia-2_1/rev/2d13e802ea3e
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1064065 - Trailing strings when removing account or deleting messages

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https://hg.mozilla.org/integration/gaia-2_1/rev/99d73b1c056f
Author: hyuna.cho <hyuna.cho@lge.com>
Desc: Bug 1067205 - [Camera] Not receiving 'visibilitychange' event when device is locked

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https://hg.mozilla.org/integration/gaia-2_1/rev/4cb3db5fd4d7
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 978014 - [FDN] Edit FDN contact does not ask for PUK2 password when PIN2 gets blocked

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https://hg.mozilla.org/integration/gaia-2_1/rev/c6ec2fac2c69
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 1058419 - [Devices][Storage][Flame] SD card is an option for default media location when no SD card inserted
Bumping manifests a=b2g-bump