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

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https://hg.mozilla.org/integration/gaia-2_1/rev/468a49e83457
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #26308 from nullaus/v2.1

Merge pull request #25973 from KevinGrandon/bug_1095187_debug_download_i...

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https://hg.mozilla.org/integration/gaia-2_1/rev/b3b84a8f38a5
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #25973 from KevinGrandon/bug_1095187_debug_download_intermittent_test

Bug 1095187 - Software Home Button - File Open Error Proper layout for file error dialog - Wait for download success +autoland
(cherry picked from commit c680e54411a729a2ed040432cec4247fa2a8b44d) a=test-only
Bumping manifests a=b2g-bump