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

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https://hg.mozilla.org/integration/gaia-central/rev/d41dc9ef60e7
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #14059 from rexboy7/fix-bug928597

Bug 928597 - [Dialer][CDMA] Show switch call text in proper font size

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https://hg.mozilla.org/integration/gaia-central/rev/81a06e037836
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 928597 - [Dialer][CDMA] Show switch call text in proper font size

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https://hg.mozilla.org/integration/gaia-central/rev/518c9b0c1ed6
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #13250 from EverythingMe/933146-file-ext-regex

Bug 933146 - Improve file-type regex in LazyLoader [r=gnarf, ranbena]

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https://hg.mozilla.org/integration/gaia-central/rev/87ff49045007
Author: Amir Nissim <amirn@everything.me>
Desc: Bug 933146 - Improve file-type regex in LazyLoader [r=gnarf, ranbena]