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

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https://hg.mozilla.org/integration/gaia-central/rev/3b3fad17a78c
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #24512 from gmarty/Bug-1073566-Utility-Tray-Alignment-header-text

Bug 1073566 - [Utility Tray] Alignment of header text

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https://hg.mozilla.org/integration/gaia-central/rev/e1753292059a
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1073566 - [Utility Tray] Alignment of header text
Bumping manifests a=b2g-bump