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

========

https://hg.mozilla.org/integration/gaia-central/rev/77e1d4b6053d
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18686 from bebef1987/gallery

Bug 1000062 - Delete some more redundant tests

========

https://hg.mozilla.org/integration/gaia-central/rev/62372a8c1f46
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1000062 - Delete some more redundant tests

========

https://hg.mozilla.org/integration/gaia-central/rev/4b70a037efdf
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #18233 from julienw/995173-fix-notice-timeout-v2

Bug 995173 - [Messages] The in-app notification for the "message is too ...

========

https://hg.mozilla.org/integration/gaia-central/rev/286e5b47189e
Author: Julien Wajsberg <julien@mozilla.com>
Desc: Bug 995173 - [Messages] The in-app notification for the "message is too big" state should not disappear after 2 seconds r=schung
Bumping manifests a=b2g-bump