Roll Flutter Engine from 48bf7ac59254 to 491f317978f4 (2 revisions) (#130107)

https://github.com/flutter/engine/compare/48bf7ac59254...491f317978f4

2023-07-06 chinmaygarde@google.com Account for updated Impeller label. (flutter/engine#43450)
2023-07-06 bdero@google.com [Impeller] Fix DrawPicture. (flutter/engine#43446)

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

-48bf7ac592547babc572fc0f0f5b8f019b75fa53
+491f317978f4258332d3b8946395a5888d510274