Manually roll engine to 56b13559807bf4cb83d16c659757d6ae4f209490 (#79953)

56b135598 Roll Dart SDK from e778310fcdcc to dda1a31495e3 (1 revision) (#25470)
7ca642c80 Roll Skia from 0195bec798a9 to 2f5a91c531de (1 revision) (#25469)
5cea3a738 Refactor GPU access switch (#24356)
e2791be97 Roll Fuchsia Mac SDK from Z-pl5laFz... to a9NOB6sdo... (#25468)
4cd3ab8d8 Roll Fuchsia Linux SDK from dl1JUKVuj... to 0Db2pEb0U... (#25467)
3eb672c77 Roll Dart SDK from 9704370488b0 to e778310fcdcc (1 revision) (#25466)
e1b291c9b Roll Skia from d986f476ae68 to 0195bec798a9 (1 revision) (#25463)
186eeb752 Revert "Reland: Call Dart plugin registrant if available (#25375)" (#25462)
63fda233d Roll Skia from 601abfacc736 to d986f476ae68 (5 revisions) (#25461)
c70b8ca59 Roll Dart SDK from b9471aadaa1a to 9704370488b0 (1 revision) (#25459)

bin/internal/engine.version

-92f4dfb0484f3ede943b73eac92bbce42c15b8f8
+56b13559807bf4cb83d16c659757d6ae4f209490