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

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https://hg.mozilla.org/integration/gaia-central/rev/c74809c0a807
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #18569 from RudyLu/keyboard/Bug985333-key_popup_case

Bug 985333 - [Keyboard UX update][User Story] Default Upper case layout
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/a75b34e0fbd2
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 985333 - [Keyboard UX update][User Story] Default Upper case layout
and typing hints.
Bumping manifests a=b2g-bump