build(deps): bump backtrace from 0.3.49 to 0.3.50

Bumps [backtrace](https://github.com/rust-lang/backtrace-rs) from 0.3.49 to 0.3.50.
- [Release notes](https://github.com/rust-lang/backtrace-rs/releases)
- [Commits](rust-lang/backtrace-rs@0.3.49...0.3.50)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

servo-tidy.toml

@@ -32,9 +32,10 @@ packages = [
   "cocoa",
   "gleam",
   "libloading",
-  "wayland-sys",
+  "miniz_oxide",
   "parking_lot",
   "parking_lot_core",
+  "wayland-sys",
 
   # https://github.com/servo/servo/pull/23288#issuecomment-494687746
   "gl_generator",