Bump Polyfill from 7.27.0 to 7.29.0 in /src

Bumps [Polyfill](https://github.com/SimonCropp/Polyfill) from 7.27.0 to 7.29.0.
- [Commits](SimonCropp/Polyfill@7.27.0...7.29.0)

---
updated-dependencies:
- dependency-name: Polyfill
  dependency-version: 7.29.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -10,7 +10,7 @@
     <PackageVersion Include="Fody" Version="6.9.2" />
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
-    <PackageVersion Include="Polyfill" Version="7.27.0" />
+    <PackageVersion Include="Polyfill" Version="7.29.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.150" />
     <PackageVersion Include="Resourcer.Fody" Version="1.8.1" />
     <PackageVersion Include="Serilog" Version="4.2.0" />