Upgrade vello, vello_cpu, skrifa, and read-fonts (#38860)

Bumps `vello`, `vello_cpu`,`skrifa`, and `read-fonts` dependencies.

Notes:
- The primary motivation for this is so that our version of `read-fonts`
matches the version used by current releases of `harfrust`
- `vello_cpu` now defaults to `RenderMode::OptimizeSpeed` so we don't
need to pass this explicitly.

Signed-off-by: Nico Burns <nico@nicoburns.com>

components/canvas/vello_cpu_backend.rs

@@ -111,9 +111,7 @@ impl VelloCPUDrawTarget {
         if self.state == State::Drawing {
             self.ignore_clips(|self_| {
                 self_.ctx.flush();
-                self_
-                    .ctx
-                    .render_to_pixmap(&mut self_.pixmap, vello_cpu::RenderMode::OptimizeSpeed);
+                self_.ctx.render_to_pixmap(&mut self_.pixmap);
                 self_.ctx.reset();
                 self_.state = State::Rendered;
             });