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

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https://hg.mozilla.org/integration/gaia-central/rev/f5b674549305
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #26468 from mancas/bug1105032

Bug 1105032 - Keyboard is overlapping SIM PIN dialog buttons with SHB en...

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https://hg.mozilla.org/integration/gaia-central/rev/68a3666233be
Author: Manuel <manuel.casasbarrado@telefonica.com>
Desc: Bug 1105032 - Keyboard is overlapping SIM PIN dialog buttons with SHB enabled

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https://hg.mozilla.org/integration/gaia-central/rev/64b01ade6878
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #26438 from mancas/bug1102550

Bug 1102550 - [FTU] Enabling Airplane Mode via Power Menu and refreshing...

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https://hg.mozilla.org/integration/gaia-central/rev/f0853aadae50
Author: Manuel <manuel.casasbarrado@telefonica.com>
Desc: Bug 1102550 - [FTU] Enabling Airplane Mode via Power Menu and refreshing Wi-Fi Connections can block User
Bumping manifests a=b2g-bump