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

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https://hg.mozilla.org/integration/gaia-central/rev/c759db1bcc07
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #26367 from azasypkin/bug-1094076-intermittent-test-wait

 Bug 1094076 - Intermittent failing test, TEST-UNEXPECTED-FAIL | apps/…  …sms/test/marionette/composer_test.js | Messages Composer Messages Composer Test Suite Message char counter and MMS label. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/96338d97aa8c
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1094076 - Intermittent failing test, TEST-UNEXPECTED-FAIL | apps/sms/test/marionette/composer_test.js | Messages Composer Messages Composer Test Suite Message char counter and MMS label. r=julien
Bumping manifests a=b2g-bump