nuget: bump OpenTK.Graphics and OpenTK.Core

Bumps OpenTK.Graphics and OpenTK.Core. These dependencies needed to be updated together.

Updates `OpenTK.Graphics` from 4.8.1 to 4.8.2

Updates `OpenTK.Core` from 4.8.1 to 4.8.2

---
updated-dependencies:
- dependency-name: OpenTK.Graphics
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: OpenTK.Core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Directory.Packages.props

@@ -27,8 +27,8 @@
     <PackageVersion Include="NetCoreServer" Version="7.0.0" />
     <PackageVersion Include="NUnit" Version="3.13.3" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.1.0" />
-    <PackageVersion Include="OpenTK.Core" Version="4.8.1" />
-    <PackageVersion Include="OpenTK.Graphics" Version="4.8.1" />
+    <PackageVersion Include="OpenTK.Core" Version="4.8.2" />
+    <PackageVersion Include="OpenTK.Graphics" Version="4.8.2" />
     <PackageVersion Include="OpenTK.Audio.OpenAL" Version="4.8.1" />
     <PackageVersion Include="OpenTK.Windowing.GraphicsLibraryFramework" Version="4.8.1" />
     <PackageVersion Include="Ryujinx.Audio.OpenAL.Dependencies" Version="1.21.0.1" />