Bump PolySharp from 1.7.1 to 1.8.1

Bumps [PolySharp](https://github.com/Sergio0694/PolySharp) from 1.7.1 to 1.8.1.
- [Release notes](https://github.com/Sergio0694/PolySharp/releases)
- [Commits](Sergio0694/PolySharp@1.7.1...1.8.1)

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

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

src/ThisAssembly.AssemblyInfo/ThisAssembly.AssemblyInfo.csproj

@@ -35,7 +35,7 @@ on the `ThisAssembly.Info` class.
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
-    <PackageReference Include="PolySharp" Version="1.7.1" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.8.1" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>

src/ThisAssembly.Constants/ThisAssembly.Constants.csproj

@@ -55,7 +55,7 @@ C#:
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
-    <PackageReference Include="PolySharp" Version="1.7.1" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.8.1" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>

src/ThisAssembly.Metadata/ThisAssembly.Metadata.csproj

@@ -47,7 +47,7 @@ C#:
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
-    <PackageReference Include="PolySharp" Version="1.7.1" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.8.1" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>

src/ThisAssembly.Project/ThisAssembly.Project.csproj

@@ -46,7 +46,7 @@ C#:
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
-    <PackageReference Include="PolySharp" Version="1.7.1" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.8.1" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>

src/ThisAssembly.Resources/ThisAssembly.Resources.csproj

@@ -29,7 +29,7 @@
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
-    <PackageReference Include="PolySharp" Version="1.7.1" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.8.1" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>

src/ThisAssembly.Strings/ThisAssembly.Strings.csproj

@@ -32,7 +32,7 @@ such as "Hello {name}".
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
-    <PackageReference Include="PolySharp" Version="1.7.1" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.8.1" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>

src/ThisAssembly.Tests/ThisAssembly.Tests.csproj

@@ -28,7 +28,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="PolySharp" Version="1.7.1" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.8.1" PrivateAssets="All" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.8.0" Pack="false" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
     <PackageReference Include="xunit" Version="2.4.2" />