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

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https://hg.mozilla.org/integration/gaia-central/rev/7240a5ab28ef
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #15821 from jrburke/bug905940-email-text-font

Bug 905940 - [Buri][Email] E-mail app compose UI uses a non-monospace font r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/afe8d1498d6a
Author: jrburke <jrburke@gmail.com>
Desc: Bug 905940 - [Buri][Email] E-mail app compose UI uses a non-monospace font

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https://hg.mozilla.org/integration/gaia-central/rev/75c179f3b6ce
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #15824 from jrburke/bug964530-email-unselectable-folder

Bug 964530 - [B2G][Email] non-folders are selectable r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/7097d02a44b6
Author: jrburke <jrburke@gmail.com>
Desc: Bug 964530 - [B2G][Email] non-folders are selectable
Bumping manifests a=b2g-bump