Remove unneeded skipped crates for duplicate dependencies (#5678)

# Objective

The `deny.toml` file defines some crates that are skipped for duplicate dependency detection, because the issues are deeper in the dependency tree and not easily fixable.

However, two of those exceptions are no longer necessary.

## Solution

Remove `hashbrown` and `mio` from the skipped crates, according to `cargo deny check` this is no longer needed.

Author: TimJentzsch

deny.toml

@@ -38,8 +38,6 @@ skip = [
     { name = "core-foundation", version = "0.7" },      # from winit v0.26.0
     { name = "core-foundation-sys", version = "0.7" },  # from winit v0.26.0
     { name = "core-graphics", version = "0.19" },       # from winit v0.26.0
-    { name = "hashbrown", version = "0.11" },           # from wgpu v0.12 - https://github.com/zakarumych/gpu-descriptor/pull/21
-    { name = "mio", version = "0.7" },                  # from notify v5.0.0-pre.11
     { name = "ndk", version = "0.5" },                  # from winit v0.26.1
     { name = "ndk-glue", version = "0.5" },             # from winit v0.26.1
     { name = "ndk-sys", version = "0.2" },              # from winit v0.26.1