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

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https://hg.mozilla.org/integration/gaia-central/rev/9a67a1389c84
Author: gitmai <mri@tid.es>
Desc: Merge pull request #16474 from gitmai/bug-968091-CC-add-lazy-load

Bug 968091 cc add lazy load
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/70bad7080523
Author: mai <mri@tid.es>
Desc: Bug 968091 -[Cost Control] Use lazy-load to load JS dependencies

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https://hg.mozilla.org/integration/gaia-central/rev/4f63c4620799
Author: Albert <acperez@tid.es>
Desc: Merge pull request #16528 from acperez/bug-967402

Bug 967402 - Implement screen requesting confirmation when retrying to load a page with POST data

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https://hg.mozilla.org/integration/gaia-central/rev/cc05b53d2252
Author: Albert <acperez@tid.es>
Desc: Bug 967402 - Implement screen requesting confirmation when retrying to load a page with POST data
Bumping manifests a=b2g-bump