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

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https://hg.mozilla.org/integration/gaia-central/rev/03cca36c7c54
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #16444 from askeing/974283

Bug 974283 - Fix intermittent failure of test_music_album_mp3.py

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https://hg.mozilla.org/integration/gaia-central/rev/52c615d0d98b
Author: askeing <askeing@gmail.com>
Desc: Bug 974283 - Fix intermittent failure of test_music_album_mp3.py
Bumping manifests a=b2g-bump