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

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https://hg.mozilla.org/integration/gaia-central/rev/60f38accb1d4
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #24670 from sudheesh001/Patch_1069616

Bug 1069616 - labels reload and stop buttons for accessiblity r=yzen

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https://hg.mozilla.org/integration/gaia-central/rev/53250165729a
Author: sudheesh001 <sudheesh1995@outlook.com>
Desc: Bug 1069616 - labels reload and stop buttons for accessiblity r=yzen
Bumping manifests a=b2g-bump