Bump PolySharp from 1.14.1 to 1.15.0

Bumps [PolySharp](https://github.com/Sergio0694/PolySharp) from 1.14.1 to 1.15.0.
- [Release notes](https://github.com/Sergio0694/PolySharp/releases)
- [Commits](Sergio0694/PolySharp@1.14.1...1.15.0)

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

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

Author: dependabot[bot]

src/CodeAnalysis/CodeAnalysis.csproj

@@ -14,7 +14,7 @@
   <ItemGroup>
     <PackageReference Include="NuGetizer" Version="1.2.4" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" Pack="false" />
-    <PackageReference Include="PolySharp" Version="1.14.1" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.15.0" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>