Bumping gaia.json for 7 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/42da22fe3d59
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #28289 from gaye/retry-handle-bad-marionette-mocha-output

Add logging and error to retry script for case when marionette-mocha output is missing a=test-only

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https://hg.mozilla.org/integration/gaia-central/rev/67df20d88567
Author: gaye <gaye@mozilla.com>
Desc: Fix regexp

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https://hg.mozilla.org/integration/gaia-central/rev/c8767c4c6123
Author: gaye <gaye@mozilla.com>
Desc: Add logging and error to retry script for case when marionette-mocha output is missing epilogue

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https://hg.mozilla.org/integration/gaia-central/rev/154f65bb243a
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #28156 from zbraniecki/1132038-l10n-allows-values-to-be-empty

Bug 1132038 - [L10n] Allow values to be empty. r=stas

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https://hg.mozilla.org/integration/gaia-central/rev/190f1efccabc
Author: Zibi Braniecki <gandalf@mozilla.com>
Desc: Bug 1132038 - [L10n] Allow values to be empty

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https://hg.mozilla.org/integration/gaia-central/rev/e1bbd8f687b9
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1129584 - merge pull request #28036 from davidflanagan:bug1129584.3 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/052021141503
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1129584 - initialize MediaDB and start creating thumbnails sooner

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "cb452d55651beb33ae19a513824ad79d61799495", 
+        "git_revision": "620aecfde85a8b093247837c55de2708e22be1e1", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "6c1ba29d642ff2c115c2903ad08c5ba0638efbb8", 
+    "revision": "42da22fe3d59646d07bad417e194969dd2cc891d", 
     "repo_path": "integration/gaia-central"
 }