Manual roll Flutter Engine from 5b9fc4eaec84 to b2bdd68ede15 (2 revis…

…ions) (flutter#151868)

Manual roll requested by [email protected]

flutter/engine@5b9fc4e...b2bdd68

2024-07-16 [email protected] [Impeller] Use depth transform in framebuffer blend entities. (flutter/engine#53951)
2024-07-16 [email protected] [macOS] Eliminate archive_gen_snapshot target (flutter/engine#53948)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC [email protected],[email protected] on the revert to ensure that a human
is aware of the problem.

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https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

bin/internal/engine.version

@@ -1 +1 @@
-5b9fc4eaec84aadb427c1f6ff5f13a93c078e81a
+b2bdd68ede150443693888751c5f4899d9eae222