Bump PolySharp from 1.15.0 to 1.16.0

---
updated-dependencies:
- dependency-name: PolySharp
  dependency-version: 1.16.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Directory.Build.props

@@ -57,7 +57,7 @@
 
   <ItemGroup Condition=" '$(TargetFrameworkIdentifier)' == '.NETFramework' ">
     <!-- Backfills features of .NET 8 for older versions of .NET -->
-    <PackageReference Include="PolySharp" Version="1.15.0" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.16.0" PrivateAssets="All" />
   </ItemGroup>
 
   <PropertyGroup>