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

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https://hg.mozilla.org/integration/gaia-1_4/rev/9bc4b8926e08
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #23122 from luke-chang/991509_v1.4_tamil_input_method

Bug 991509 - Adding Tamil input method for B2G

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https://hg.mozilla.org/integration/gaia-1_4/rev/0cfcff54b2b3
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 991509 - Adding Tamil input method for B2G

Cherry-picked from 5a8f0e4f9e146dc2fdd2317841819ea5aa9f5211

Conflicts:

	apps/keyboard/style/keyboard.css
	build/config/keyboard-layouts.json
Bumping manifests a=b2g-bump