Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/cc7c4e2bd03e
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #15120 from nullaus/bug957733-net-error

bug 957733 r=mhenretty

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https://hg.mozilla.org/integration/gaia-1_3/rev/0ff5edd3e696
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 957733

* Add v1.3 specific implementation for parsing the about:neterror URL.

r=mhenretty