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

========

https://hg.mozilla.org/integration/gaia-central/rev/b6d37e5c694a
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #23789 from TheoChevalier/bug1064065-remove-strings

Bug 1064065 - Trailing strings when removing account or deleting message... r=jrburke

========

https://hg.mozilla.org/integration/gaia-central/rev/4798bc4ea088
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1064065 - Trailing strings when removing account or deleting messages

========

https://hg.mozilla.org/integration/gaia-central/rev/1856448ec83e
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #23788 from TheoChevalier/bug1064065-trailing-strings

Bug 1064065 - Trailing strings when removing account or deleting message... r=jrburke

========

https://hg.mozilla.org/integration/gaia-central/rev/eb1b90674a7a
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1064065 - Trailing strings when removing account or deleting messages
Bumping manifests a=b2g-bump