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

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https://hg.mozilla.org/integration/gaia-central/rev/d74e738cd626
Author: Fischer-L <Fischer-L@users.noreply.github.com>
Desc: Merge pull request #33898 from Fischer-L/bug_1240493-update-fling-player-search-time

Bug 1240493 - [Stingray][fling-player][TV][2.5] Update video backward/forward searching time, r=rex

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https://hg.mozilla.org/integration/gaia-central/rev/1f4d812f6bdb
Author: Fischer.json <foxbrush@Fischerjsons-MacBook-Pro.local>
Desc: Bug 1240493 - [Stingray][fling-player][TV][2.5] Update video backward/forward searching time

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https://hg.mozilla.org/integration/gaia-central/rev/ae12485a5d55
Author: Fischer-L <Fischer-L@users.noreply.github.com>
Desc: Merge pull request #33912 from Fischer-L/bug_1238862-fling-player-duration-0

Bug 1238862 - [TV][Seamless experience] The total length of video should not be 00:00, r=rex

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https://hg.mozilla.org/integration/gaia-central/rev/1ce8ce3158ce
Author: Fischer.json <foxbrush@Fischerjsons-MacBook-Pro.local>
Desc: Bug 1238862 - [TV][Seamless experience] The total length of video should not be 00:00

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "dbecbea7e2bda48a34ce7bbda924f885289b45b8", 
+        "git_revision": "619766a1ce78d50fb8a3b5a9e0821c335a0ed7ee", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "57d90a8bd7b767d5e66348cfa2e2098316caab33", 
+    "revision": "d74e738cd626558fb9dc289500ad28ae29deab03", 
     "repo_path": "integration/gaia-central"
 }