Update wayland-backend to fix Wayland file dialog crash (#60621)

On Wayland, closing a window in the brief gap between requesting a
portal file dialog and ashpd exporting the window's surface (used to
parent the dialog) crashed Zed with `Unknown opcode 0 for object
<anonymous>@0`
([ZED-9KB](https://zed-dev.sentry.io/issues/7568720776/)). When the
export request fails because the surface is already dead,
wayland-scanner's generated code silently returns an inert proxy, and
ashpd's `Drop` impl later sends `destroy` on it — which wayland-backend
0.3.11 answers with a panic, because it looks up the request opcode
before checking whether the object is null. wayland-backend 0.3.15 fixes
this
([Smithay/wayland-rs#890](https://github.com/Smithay/wayland-rs/issues/890))
by returning an error instead, which the generated destructor discards,
so the drop becomes a harmless no-op. This bumps the lockfile to 0.3.15
and raises the version floor in `gpui_linux` so the fix can't silently
regress via a fresh lockfile.

Closes FR-100

Release Notes:

- Fixed a crash on Linux (Wayland) when a window was closed just as a
file dialog was being opened.

Cargo.lock

@@ -5344,9 +5344,9 @@ dependencies = [
 
 [[package]]
 name = "dlib"
-version = "0.5.2"
+version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "330c60081dcc4c72131f8eb70510f1ac07223e5d4163db481a04a0befcffa412"
+checksum = "ab8ecd87370524b461f8557c119c405552c396ed91fc0a8eec68679eab26f94a"
 dependencies = [
  "libloading",
 ]
@@ -20843,9 +20843,9 @@ dependencies = [
 
 [[package]]
 name = "wayland-backend"
-version = "0.3.11"
+version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "673a33c33048a5ade91a6b139580fa174e19fb0d23f396dca9fa15f2e1e49b35"
+checksum = "2857dd20b54e916ec7253b3d6b4d5c4d7d4ca2c33c2e11c6c76a99bd8744755d"
 dependencies = [
  "cc",
  "downcast-rs",
@@ -20929,9 +20929,9 @@ dependencies = [
 
 [[package]]
 name = "wayland-sys"
-version = "0.31.7"
+version = "0.31.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34949b42822155826b41db8e5d0c1be3a2bd296c747577a43a3e6daefc296142"
+checksum = "d8eab23fefc9e41f8e841df4a9c707e8a8c4ed26e944ef69297184de2785e3be"
 dependencies = [
  "dlib",
  "log",

crates/gpui_linux/Cargo.toml

@@ -96,7 +96,7 @@ scap = { workspace = true, optional = true }
 
 # Wayland
 calloop-wayland-source = { version = "0.4.1", optional = true }
-wayland-backend = { version = "0.3.3", features = [
+wayland-backend = { version = "0.3.15", features = [
     "client_system",
     "dlopen",
 ], optional = true }