build(deps): update pollster requirement from 0.3.0 to 0.4.0

---
updated-dependencies:
- dependency-name: pollster
  dependency-type: direct:production
...

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

Cargo.toml

@@ -64,7 +64,7 @@ foreign-types-shared = "0.3"
 libc = "0.2"
 reis = { version = "0.3.0", optional = true }
 ashpd = { version = "0.9.1", optional = true }
-pollster = { version = "0.3.0", optional = true }
+pollster = { version = "0.4.0", optional = true }
 once_cell = { version = "1.19.0", optional = true }
 wayland-protocols-misc = { version = "0.3", features = [
     "client",