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

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https://hg.mozilla.org/integration/gaia-central/rev/1503abec2fae
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #34106 from rexboy7/1249534-unpin-bookmark-regression

Bug 1249534 - [TV][AppDeck] Fix bookmark pin-to-home regression.r=lchang

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https://hg.mozilla.org/integration/gaia-central/rev/01b0651db5a8
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 1249534 - [TV][AppDeck] Fix bookmark pin-to-home regression

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "76352c135b9b0d2e3237933264215ebdeb30bbb0", 
+        "git_revision": "78a670b73b4ddc250abd4e2bbaae8cfda31f8287", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "a6616b02310eebc39ad890547c81d634d3aaa6c0", 
+    "revision": "1503abec2faedd15e0eafaaca5de97ed447141ba", 
     "repo_path": "integration/gaia-central"
 }