build(deps): Bump Nerdbank.GitVersioning from 3.4.216 to 3.4.220 in /src (#59)

Bumps [Nerdbank.GitVersioning](https://github.com/dotnet/Nerdbank.GitVersioning) from 3.4.216 to 3.4.220.
- [Release notes](https://github.com/dotnet/Nerdbank.GitVersioning/releases)
- [Commits](https://github.com/dotnet/Nerdbank.GitVersioning/compare/v3.4.216...v3.4.220)

---
updated-dependencies:
- dependency-name: Nerdbank.GitVersioning
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/Directory.Build.props

@@ -15,7 +15,7 @@
         </RestoreSources>
     </PropertyGroup>
     <ItemGroup>
-        <PackageReference Include="Nerdbank.GitVersioning" Version="3.4.216" PrivateAssets="all" />
+        <PackageReference Include="Nerdbank.GitVersioning" Version="3.4.220" PrivateAssets="all" />
     </ItemGroup>
     <ItemGroup Condition="'$(InstallAvalonia)' == 'true'">
         <PackageReference Include="Avalonia" Version="0.10.999-cibuild0012810-beta" />