Bump Polyfill from 7.7.1 to 7.8.0 in /src

Bumps [Polyfill](https://github.com/SimonCropp/Polyfill) from 7.7.1 to 7.8.0.
- [Commits](SimonCropp/Polyfill@7.7.1...7.8.0)

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

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

src/Directory.Packages.props

@@ -7,7 +7,7 @@
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="NServiceBus" Version="9.2.3" />
-    <PackageVersion Include="Polyfill" Version="7.7.1" />
+    <PackageVersion Include="Polyfill" Version="7.8.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.147" />
     <PackageVersion Include="Verify.XunitV3" Version="28.6.0" />
     <PackageVersion Include="xunit.v3" Version="1.0.0" />