Bump System.Memory from 4.5.5 to 4.6.3

---
updated-dependencies:
- dependency-name: System.Memory
  dependency-version: 4.6.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/OpenVINO.NET.GenAI/OpenVINO.NET.GenAI.csproj

@@ -64,7 +64,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Memory" Version="4.5.5" />
+    <PackageReference Include="System.Memory" Version="4.6.3" />
     <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
     <PackageReference Include="System.Threading.Channels" Version="7.0.0" />
   </ItemGroup>