Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/94831533747a
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #18718 from azasypkin/bug-995350-save-button

Bug 995350 - [SMS] - Display Save button for attached image file name having hidden directories ".gallery/". r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/bccb07f2864c
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 995350 - [SMS] - Display Save button for attached image file name having hidden directories ".gallery/". r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/9236798c84be
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #18416 from azasypkin/bug-997053-attachment-assets

Bug 997053 - [Messages] Update @2.25x assets for attachment placeholders and move it to the correct place.

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https://hg.mozilla.org/integration/gaia-central/rev/0ab75ba7086c
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 997053 - [Messages] Update @2.25x assets for attachment placeholders and move it to the correct place. r=julien
Bumping manifests a=b2g-bump