Roll Flutter Engine from 1478f4e75dd9 to b06b3e0d75ad (1 revision) (#143275)

https://github.com/flutter/engine/compare/1478f4e75dd9...b06b3e0d75ad

2024-02-10 matanlurey@users.noreply.github.com Remove legacy references to `Cirrus` and suspected dead-code. (flutter/engine#50442)

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 chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
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

-1478f4e75dd9b1b8d25853bac651aae97ad79f57
+b06b3e0d75ad6e250eeafd06b65de7e25621d858