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

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https://hg.mozilla.org/integration/gaia-central/rev/c10b87c011c7
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #18616 from evanxd/bug-951084

Bug 951084 - [Calendar] Today button design

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https://hg.mozilla.org/integration/gaia-central/rev/08b3b4e89229
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 951084 - Visual refresh for today button.
Bumping manifests a=b2g-bump