Bump Polyfill from 7.4.1 to 7.5.0 in /src (#249)

src/Directory.Packages.props

@@ -6,7 +6,7 @@
   <ItemGroup>
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
-    <PackageVersion Include="Polyfill" Version="7.4.1" />
+    <PackageVersion Include="Polyfill" Version="7.5.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.144" />
     <PackageVersion Include="Quibble" Version="0.3.1" />
     <PackageVersion Include="Verify" Version="28.3.2" />