Fix .packages breakage and roll engine to 83b9a591a3d5 (#106584)

* 9508a368d Roll Dart SDK from 692562354d6d to d3b8091c30f0 (1 revision) (flutter/engine#34273)

* a2985c034 Roll Fuchsia Linux SDK from F1U6IH2Nf... to aRT7s0Yct... (flutter/engine#34251)

* 54867f360 Roll Skia from bdd0205ae470 to 4345a2ea731a (1 revision) (flutter/engine#34268)

* 98221a22d Clean up text input configuration in clearTextInputClient (flutter/engine#34209)

* b9e02cc83 Adds a license check shard to CI (flutter/engine#34274)

* 1daf7ba98 [Impeller] Metal:Reset Encoder viewport and scissor rect in case the command specifies no opinion (flutter/engine#34252)

* 83b9a591a [Linux] remove duplicate clone_string() in favor of g_strdup() (flutter/engine#34031)

* Don't use .packages

* Another attempt

Co-authored-by: engine-flutter-autoroll <engine-flutter-autoroll@skia.org>