Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0c35454a428e
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #16124 from rnowm/img-compression

images optimized

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https://hg.mozilla.org/integration/gaia-central/rev/3385104d071f
Author: rnowm <arnau@arnaumarch.com>
Desc: images optimized

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "318915a96a4ae306afe9aae33b117c3821c94c0b", 
+    "revision": "0c35454a428e047457b28b0f6f5b9f0bb920858e", 
     "repo_path": "/integration/gaia-central"
 }