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

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https://hg.mozilla.org/integration/gaia-central/rev/1b18dd8bfce2
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #25153 from mikehenrty/bug-1082885-ime-menu-shb

Bug 1082885 - Make IME Menu SHB aware

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https://hg.mozilla.org/integration/gaia-central/rev/5520397220d9
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1082885 - Make IME Menu SHB aware

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https://hg.mozilla.org/integration/gaia-central/rev/4070a23a762d
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #25321 from zacc/bug_1085294

Bug 1085294 - Update expected audio channel in test_dialer.py

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https://hg.mozilla.org/integration/gaia-central/rev/689c00e476ab
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1085294 - Update expected audio channel in test_dialer.py
Bumping manifests a=b2g-bump