Bump Polyfill from 8.6.0 to 8.6.1 (#603)

---
updated-dependencies:
- dependency-name: Polyfill
  dependency-version: 8.6.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

src/Directory.Packages.props

@@ -12,7 +12,7 @@
     <PackageVersion Include="NServiceBus" Version="9.2.7" />
     <PackageVersion Include="NUnit" Version="4.3.2" />
     <PackageVersion Include="NUnit3TestAdapter" Version="5.0.0" />
-    <PackageVersion Include="Polyfill" Version="8.6.0" />
+    <PackageVersion Include="Polyfill" Version="8.6.1" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.156" />
     <PackageVersion Include="System.ComponentModel.Annotations" Version="5.0.0" />
     <PackageVersion Include="Verify.NServiceBus" Version="10.3.4" />