Bump Polyfill from 7.2.0 to 7.4.0 in /src (#1030)

Author: dependabot[bot]

src/Directory.Packages.props

@@ -18,7 +18,7 @@
     <PackageVersion Include="Microsoft.EntityFrameworkCore" Version="8.0.10" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.10" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
-    <PackageVersion Include="Polyfill" Version="7.2.0" />
+    <PackageVersion Include="Polyfill" Version="7.4.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.141" />
     <PackageVersion Include="System.Text.Encodings.Web" Version="8.0.0" />
     <PackageVersion Include="Verify.SqlServer" Version="10.1.0" />