Roll Flutter Engine from bf2e32dfd5a2 to 4956e98ab4cc (4 revisions) (#149367)

flutter/engine@bf2e32d...4956e98

2024-05-30 [email protected] [semantics] fix dartdoc grammar (flutter/engine#53121)
2024-05-30 [email protected] Roll Skia from 188ad395c3e7 to a058f601e1fb (1 revision) (flutter/engine#53131)
2024-05-30 [email protected] Replace several NSAssert with FML_CHECK/DCHECK to unblock the build (flutter/engine#53048)
2024-05-30 [email protected] [Impeller] make sure buffers are 4 aligned for foreground color blending (flutter/engine#53077)

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Author: engine-flutter-autoroll

bin/internal/engine.version

@@ -1 +1 @@
-bf2e32dfd5a27f7c89478ea0a6148da0f4ba682a
+4956e98ab4ccc454e38cb3704f0b1fbfa9f205ee