Roll Flutter Engine from 0774ddcda9b0 to 06696e768c1b (4 revisions) (…

…#134462)

flutter/engine@0774ddc...06696e7

2023-09-11 [email protected] Revert "Remove some of our hacks around JSPromise now that we have better APIs." (flutter/engine#45660)
2023-09-11 [email protected] Roll Skia from 3ed290acb65f to e6225224fb4e (2 revisions) (flutter/engine#45658)
2023-09-11 [email protected] Update skwasm build to use safer flush call (flutter/engine#45652)
2023-09-11 [email protected] Remove some of our hacks around JSPromise now that we have better APIs. (flutter/engine#45591)

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bin/internal/engine.version

@@ -1 +1 @@
-0774ddcda9b0b7878e586a6135a026095d4feb33
+06696e768c1b1abd2393099d4ccacfdff2ad4739