nuget: Bump the opentk group with 3 updates

Bumps OpenTK.Audio.OpenAL from 4.8.2 to 4.9.4
Bumps OpenTK.Graphics from 4.8.2 to 4.9.4
Bumps OpenTK.Windowing.GraphicsLibraryFramework from 4.8.2 to 4.9.4

---
updated-dependencies:
- dependency-name: OpenTK.Audio.OpenAL
  dependency-version: 4.9.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: opentk
- dependency-name: OpenTK.Graphics
  dependency-version: 4.9.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: opentk
- dependency-name: OpenTK.Windowing.GraphicsLibraryFramework
  dependency-version: 4.9.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: opentk
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -29,9 +29,9 @@
     <PackageVersion Include="NUnit3TestAdapter" Version="4.1.0" />
     <PackageVersion Include="open.nat.core" Version="2.1.0.5" />
     <PackageVersion Include="OpenTK.Core" Version="4.8.2" />
-    <PackageVersion Include="OpenTK.Graphics" Version="4.8.2" />
-    <PackageVersion Include="OpenTK.Audio.OpenAL" Version="4.8.2" />
-    <PackageVersion Include="OpenTK.Windowing.GraphicsLibraryFramework" Version="4.8.2" />
+    <PackageVersion Include="OpenTK.Graphics" Version="4.9.4" />
+    <PackageVersion Include="OpenTK.Audio.OpenAL" Version="4.9.4" />
+    <PackageVersion Include="OpenTK.Windowing.GraphicsLibraryFramework" Version="4.9.4" />
     <PackageVersion Include="Ryujinx.Audio.OpenAL.Dependencies" Version="1.21.0.1" />
     <PackageVersion Include="Ryujinx.Graphics.Nvdec.Dependencies" Version="5.0.3-build14" />
     <PackageVersion Include="Ryujinx.Graphics.Vulkan.Dependencies.MoltenVK" Version="1.2.0" />