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

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https://hg.mozilla.org/integration/gaia-2_0/rev/07bd9a51d77a
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22028 from tauzen/Bug_1039239_2.0_with_test

Bug 1039239 - Better NFC handover error handling - v2.0

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https://hg.mozilla.org/integration/gaia-2_0/rev/769d85f14a9f
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: Bug 1039239 - Better NFC handover error handling - v2.0

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https://hg.mozilla.org/integration/gaia-2_0/rev/6253f6a6ca62
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #21905 from elefant/bug/1030550-dup-system-message-v2.0

Bug 1030550 - Turn off bfcache by adding unload event listener. r=rik

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https://hg.mozilla.org/integration/gaia-2_0/rev/da762ba333ce
Author: hchang <hchang@mozilla.com>
Desc: Bug 1030550 - Turn off bfcache by adding unload event listener. r=rik

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https://hg.mozilla.org/integration/gaia-2_0/rev/818e503e6080
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #21964 from EverythingMe/1040618-migrate

Bug 1040618 - [B2G][OTA] Several issues opening smart collections migrat...(cherry picked from commit 7543ff483b844dd515bfaa6cd219b301047e445a)
Bumping manifests a=b2g-bump