Updating AVD Dependency for Android 28 Emulator (#160978)

Emulators depending on Android 28 API are currently failing. Advancing
the AVD dependency to 8733065022087935185, the same version used in
other repos, should fix the errors.

Fixes b/379736755

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engine/src/flutter/ci/builders/linux_android_emulator.json

@@ -139,7 +139,7 @@
                         },
                         {
                             "dependency": "avd_cipd_version",
-                            "version": "build_id:8735216702926189361"
+                            "version": "build_id:8733065022087935185"
                         }
                     ],
                     "contexts": [

engine/src/flutter/ci/builders/linux_android_emulator_34.json

@@ -139,7 +139,7 @@
                         },
                         {
                             "dependency": "avd_cipd_version",
-                            "version": "build_id:8740267484269553649"
+                            "version": "build_id:8733065022087935185"
                         }
                     ],
                     "contexts": [