Bump Polyfill from 7.1.1 to 7.2.0 in /src (#686)

Author: dependabot[bot]

src/Directory.Packages.props

@@ -7,7 +7,7 @@
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageVersion Include="NServiceBus" Version="9.2.2" />
-    <PackageVersion Include="Polyfill" Version="7.1.1" />
+    <PackageVersion Include="Polyfill" Version="7.2.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.139" />
     <PackageVersion Include="Verify" Version="27.1.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />