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

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https://hg.mozilla.org/integration/gaia-2_0/rev/c8ed0b1bf609
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #23402 from luke-chang/1047475_v2.0_sms_reset_scrollbar

Bug 1047475 - [Messages] The suggestions panel scroll position should be reset after it's been hidden

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https://hg.mozilla.org/integration/gaia-2_0/rev/751018b41b60
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 1047475 - [Messages] The suggestions panel scroll position should be reset after it's been hidden

cherry-picked from 20eeb7c7724ca51a2139cdb7bd5dd137f4be830f
Bumping manifests a=b2g-bump