Roll Flutter Engine from 58cc54197a54 to 3fa6084dfb36 (1 revision) (#125839)

https://github.com/flutter/engine/compare/58cc54197a54...3fa6084dfb36

2023-05-01 timmaffett@gmail.com Fixes font-subset to not drop GSUB/GPOS/GDEF tables for variable fonts where they are needed Fixes #125704 (flutter/engine#41592)

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 jsimmons@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://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

bin/internal/engine.version

-58cc54197a5486044a9fdadec707f8d0b66d1d61
+3fa6084dfb36ca7c69a88b94a05c6e0ebf635dbd