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

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https://hg.mozilla.org/integration/gaia-central/rev/8965baef85e6
Author: Guillaume C. Marty <edo999@gmail.com>
Desc: Merge pull request #21454 from gmarty/Bug-1035243-Header-text-AppChrome-misaligned

Bug 1035243 - Header text in AppChrome is misaligned

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https://hg.mozilla.org/integration/gaia-central/rev/4c2a0d46e2f8
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1035243 - Header text in AppChrome is misaligned
Bumping manifests a=b2g-bump