Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f7d853fd8119
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #20473 from evanxd/bug-1021968

Bug 1021968 - Set font size of input

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https://hg.mozilla.org/integration/gaia-central/rev/e7b9ca9a17ac
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1021968 - Set font size of input
Bumping manifests a=b2g-bump