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

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https://hg.mozilla.org/integration/gaia-central/rev/f5938a9fc286
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14690 from askeing/950570

Bug 950570 - Fix test_settings_airplane_mode.py

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https://hg.mozilla.org/integration/gaia-central/rev/b53c9f24e914
Author: askeing <askeing@gmail.com>
Desc: Bug 950570 - Fix test_settings_airplane_mode.py

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https://hg.mozilla.org/integration/gaia-central/rev/d2a8dfa4915d
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #14675 from TheoChevalier/ftu-reused-strings

Bug 950470 - [FTU][l12y] 'Join hidden network' string is reused in diffe...

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https://hg.mozilla.org/integration/gaia-central/rev/78c029bbb835
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 950470 - [FTU][l12y] 'Join hidden network' string is reused in different contexts