Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ce940064a0ee
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #22147 from yurenju/settings-git-commit-win

Bug 1036821 - git commit hash isn't wrote to settings/resources/gaia_commit.txt on Windows r=@cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/3026d71421c8
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1036821 - execute git by shell if we got error from subprocess module

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https://hg.mozilla.org/integration/gaia-central/rev/c2b4f8bbabd0
Author: William Lachance <wlachance@mozilla.com>
Desc: Bug 1039739 - Make it more clear what command we're executing;r=yuren

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https://hg.mozilla.org/integration/gaia-central/rev/5820a0c36e54
Author: William Lachance <wlachance@mozilla.com>
Desc: Bug 1039739 - Add some logging when writing the git commit id into the settings app;r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/35fcf72388b3
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1036821 - git commit hash isn't wrote to settings/resources/gaia_commit.txt on Windows
Bumping manifests a=b2g-bump