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

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https://hg.mozilla.org/integration/gaia-central/rev/797dfb9325a4
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #23037 from gregarndt/gaia_sanity_tests

Bug 1054333 - Create Firefox OS test job for testing phone specific feat...

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https://hg.mozilla.org/integration/gaia-central/rev/661d6674c7c4
Author: Greg Arndt <garndt@mozilla.com>
Desc: Bug 1054333 - Create Firefox OS test job for testing phone specific features per checkin
Bumping manifests a=b2g-bump