Bump Polyfill from 2.0.1 to 2.1.0 in /src (#225)

Bumps [Polyfill](https://github.com/SimonCropp/Polyfill) from 2.0.1 to 2.1.0.
- [Commits](SimonCropp/Polyfill@2.0.1...2.1.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Simon Cropp <simon.cropp@gmail.com>

src/Verify.DiffPlex/Verify.DiffPlex.csproj

@@ -5,7 +5,7 @@
   <ItemGroup>
     <PackageReference Include="Argon" Version="0.15.0" />
     <PackageReference Include="DiffPlex" Version="1.7.2" />
-    <PackageReference Include="Polyfill" Version="2.0.1" PrivateAssets="all" />
+    <PackageReference Include="Polyfill" Version="2.1.0" PrivateAssets="all" />
     <PackageReference Include="Verify" Version="23.0.1" />
     <PackageReference Include="ProjectDefaults" Version="1.0.108" PrivateAssets="all" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" Condition="$(Configuration) == 'Release'" />