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

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https://hg.mozilla.org/integration/gaia-central/rev/33f186b50e2d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #25752 from mozilla-b2g/revert-25742-keyboard-aria-label

Revert "Bug 1092911 - Correct aria-label for layout switching keys

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https://hg.mozilla.org/integration/gaia-central/rev/41ef5bbd5d3e
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Revert "Bug 1092911 - Correct aria-label for layout switching keys +shepherd"

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https://hg.mozilla.org/integration/gaia-central/rev/e226c628ee22
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #25742 from timdream/keyboard-aria-label

Bug 1092911 - Correct aria-label for layout switching keys, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/af890b7ea29d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1092911 - Correct aria-label for layout switching keys
Bumping manifests a=b2g-bump