Roll engine 5af435098d34..08465e800035 (3 commits) (#25522)

https://github.com/flutter/engine/compare/5af435098d34...08465e800035

git log 5af435098d34..08465e800035 --no-merges --oneline
08465e800 Verify RunConfiguration is valid before running (flutter/engine#6922)
f986a12e2 Correct spelling in doc comments (flutter/engine#7179)
67cd7d4d3 Compile embedder unit test Dart to kernel (flutter/engine#7231)

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bin/internal/engine.version

-5af435098d340237c5e3a69bce6aaffd4e3bfe84
+08465e8000358f3c5f5144f3e745267a97506053