Roll Flutter Engine from 074135bbcc61 to 49c6dcdac5ad (1 revision) (#130252)

https://github.com/flutter/engine/compare/074135bbcc61...49c6dcdac5ad

2023-07-10 robert.ancell@canonical.com Fix leak when switching channels (flutter/engine#41827)

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 aaclarke@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

-074135bbcc6166bd395f3618b06af8b6000613fc
+49c6dcdac5ad51d78747d7c89b34a0405c241536