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

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https://hg.mozilla.org/integration/gaia-2_1/rev/9a8fe05ea0ba
Author: KWierso <kwierso@gmail.com>
Desc: Merge pull request #26160 from mikehenrty/bug-1090152-uplift

Merge pull request #25819 from mikehenrty/bug-1090152-fix-icon-visibility a=bajaj

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https://hg.mozilla.org/integration/gaia-2_1/rev/1531770a9eb8
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #25819 from mikehenrty/bug-1090152-fix-icon-visibility

Bug 1090152 - Make sure we display statusbar icons on lockscreen even wi...
Conflicts:
	apps/system/test/marionette/lib/statusbar.js

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https://hg.mozilla.org/integration/gaia-2_1/rev/bfdd70ca8079
Author: KWierso <kwierso@gmail.com>
Desc: Merge pull request #26237 from mancas/bug1089505_v2.1

Bug 1089505 - [NFC][Software Home Button] yes/no button covered by SW home button a=bajaj

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https://hg.mozilla.org/integration/gaia-2_1/rev/27956e667705
Author: Manuel Casas <manuel.casasbarrado@telefonica.com>
Desc: Bug 1089505 - [NFC][Software Home Button] yes/no button covered by SW home button
Bumping manifests a=b2g-bump