Replaced ref_slice::ref_slice with std::slice::from_ref

ref_slice::ref_slice is deprecated in ref_slice-1.2.1,
because it's redundant with std since rust 1.28.

Signed-off-by: Adrian Willenbücher <willenbuecher@xq-tec.com>

Cargo.lock

@@ -4948,12 +4948,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b5ceb840e4009da4841ed22a15eb49f64fdd00a2138945c5beacf506b2fb5ed"
 
-[[package]]
-name = "ref_slice"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e1b7878800220a76a08f32c057829511440f65528b63b940f2f2bc145d7ac68"
-
 [[package]]
 name = "regex"
 version = "1.4.5"
@@ -5162,7 +5156,6 @@ dependencies = [
  "pixels",
  "profile_traits",
  "ref_filter_map",
- "ref_slice",
  "regex",
  "script_layout_interface",
  "script_plugins",