shiny: update mtl version, again

CL 455916 fixed a warning on macOS 13, but caused one on macOS 10.13.
Update to a newer mtl that was tested on both macOS version extremes.

Change-Id: I8e96f282dd0033bf196053ad2ca8e1d524124551
Reviewed-on: https://go-review.googlesource.com/c/exp/+/456117
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
diff --git a/shiny/go.mod b/shiny/go.mod
index 360876a..7e784c3 100644
--- a/shiny/go.mod
+++ b/shiny/go.mod
@@ -3,7 +3,7 @@
 go 1.18
 
 require (
-	dmitri.shuralyov.com/gpu/mtl v0.0.0-20221207185020-b78c9fe623cc
+	dmitri.shuralyov.com/gpu/mtl v0.0.0-20221208032759-85de2813cf6b
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4
 	github.com/jezek/xgb v1.0.0
 	golang.org/x/image v0.0.0-20190802002840-cff245a6509b
diff --git a/shiny/go.sum b/shiny/go.sum
index b39be44..92706bc 100644
--- a/shiny/go.sum
+++ b/shiny/go.sum
@@ -1,5 +1,5 @@
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20221207185020-b78c9fe623cc h1:JwM5CcFeZcblrXS+wQFVo7mX2FpXrBtqCPkLO0XJssY=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20221207185020-b78c9fe623cc/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20221208032759-85de2813cf6b h1:a26Bdkl2B9PmYN6vGXnnfB2UGKjz0Moif1aEg+xTd7M=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20221208032759-85de2813cf6b/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4 h1:WtGNWLvXpe6ZudgnXrq0barxBImvnnJoMEhXAzcbM0I=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=