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

========

https://hg.mozilla.org/integration/gaia-central/rev/2eae294604eb
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #18516 from crdlc/bug-991906

Bug 991906 - [B2G][Homescreen] Long pressing an App that opened in Lands...

========

https://hg.mozilla.org/integration/gaia-central/rev/69d580609588
Author: crdlc <crdlc@tid.es>
Desc: Bug 991906 - [B2G][Homescreen] Long pressing an App that opened in Landscape mode will cause the Dock apps to shift

========

https://hg.mozilla.org/integration/gaia-central/rev/f20eb207d5ff
Author: EragonJ <eragonj@eragonj.me>
Desc: Revert "Merge pull request #17842 from EragonJ/bug-973440"

This reverts commit afcd647bb13598c1a101ac900207f4b479d26734, reversing
changes made to 6f689126518660ec160aecc25432cf47d10662eb.

========

https://hg.mozilla.org/integration/gaia-central/rev/967e29b2905c
Author: EragonJ <eragonj@eragonj.me>
Desc: Revert "Merge pull request #18565 from cctuan/973454-2"

This reverts commit 16564862869a3667af220466e48f7840c7beb8ff, reversing
changes made to 0814a85e335006475d995212691545af87e97185.
Bumping manifests a=b2g-bump