Roll engine 82765aa77db9..a1a2129bc469 (13 commits) (#30209)

https://github.com/flutter/engine/compare/82765aa77db9...a1a2129bc469

git log 82765aa77db9621dfbc50801ee2709aa0a00e04d..a1a2129bc4696e66510be984fd7908eae51eb98f --no-merges --oneline
a1a2129bc GN Format all files in the engine. (flutter/engine#8369)
82c910414 Remove old Fuchsia external mem,sem extensions
6d1a6a4f4 Allow per-platform customization of the default Skia font manager (flutter/engine#8358)
3de50b8d2 Roll src/third_party/skia 84a53268af92..7eeb74fdfd84 (3 commits) (flutter/engine#8367)
65837ab32 Roll src/third_party/skia a2cec203eea8..84a53268af92 (1 commits) (flutter/engine#8366)
ada0a8e2b Roll src/third_party/skia 57b7a792bb6f..a2cec203eea8 (1 commits) (flutter/engine#8365)
9729f1ae3 Roll src/third_party/skia bf4229cc10a1..57b7a792bb6f (5 commits) (flutter/engine#8364)
23e0c3758 Roll src/third_party/skia 01fe26360660..bf4229cc10a1 (6 commits) (flutter/engine#8363)
fd0b44045 Roll src/third_party/skia cc8c7bee7925..01fe26360660 (10 commits) (flutter/engine#8361)
96c975163 Rename threshold to access_threshold (flutter/engine#8354)
09a67fe60 update buildroot dep for https://github.com/flutter/buildroot/commit/e2ca4571fa39be20ab1bf67c65d4700612756af2 (flutter/engine#8359)
602b61213 Reduce z-fighting on Scenic (flutter/engine#8318)
b53e436f9 Roll src/third_party/dart a977273262..f29e100f42 (8 commits)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (bmparr@google.com), and stop
the roller if necessary.

bin/internal/engine.version

-82765aa77db9621dfbc50801ee2709aa0a00e04d
+a1a2129bc4696e66510be984fd7908eae51eb98f