Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/1bd6bc40a147
Author: Guillaume C. Marty <edo999@gmail.com>
Desc: Merge pull request #21443 from gmarty/Bug-103336-Header-text-bookmarks-activity-misaligned

Bug 1033365 - Header text in bookmarks activity is misaligned

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https://hg.mozilla.org/integration/gaia-central/rev/a3f42c308937
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1033365 - Header text in bookmarks activity is misaligned

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https://hg.mozilla.org/integration/gaia-central/rev/c54670808cea
Author: Guillaume C. Marty <edo999@gmail.com>
Desc: Merge pull request #20610 from gmarty/bug-908300-Solution-Truncated-Headers

Bug 908300 - Solution for Truncated Headers

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https://hg.mozilla.org/integration/gaia-central/rev/27ebe0791dd7
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1026955 - Resize and center headers according to Gecko's logic

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https://hg.mozilla.org/integration/gaia-central/rev/d267b4c7d772
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #21481 from julienw/1035640-use-app-in-bin-gaia-test

Bug 1035640 - Follow-up to bug 1021481: run the test-agent on app:// in ...

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https://hg.mozilla.org/integration/gaia-central/rev/2e93309ef746
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1035640 - Follow-up to bug 1021481: run the test-agent on app:// in bin/gaia-test r=yurenju
Bumping manifests a=b2g-bump