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

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https://hg.mozilla.org/integration/gaia-central/rev/d0c4709f9799
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Merge pull request #19510 from jonallengriffin/gaia-unit-timeout

Bug 1014028 - Use correct format in gaia_unit timeout messages, r=ahal

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https://hg.mozilla.org/integration/gaia-central/rev/3f00e7dba1a5
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Bug 1014028 - Use correct format in gaia_unit timeout messages, r=ahal
Bumping manifests a=b2g-bump