Bump Microsoft.Windows.CsWin32 from 0.3.257 to 0.3.264

---
updated-dependencies:
- dependency-name: Microsoft.Windows.CsWin32
  dependency-version: 0.3.264
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

SteamKit2/SteamKit2/SteamKit2.csproj

@@ -48,7 +48,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Windows.CsWin32" Version="0.3.257">
+    <PackageReference Include="Microsoft.Windows.CsWin32" Version="0.3.264">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>