feat: Remove Nerdbank.GitVersioning reference

Author: nickevansuk

OpenActive.NET/OpenActive.NET.csproj

@@ -33,10 +33,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Nerdbank.GitVersioning" Version="3.3.37">
-      <PrivateAssets>all</PrivateAssets>
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-    </PackageReference>
     <PackageReference Include="Schema.NET" Version="7.0.1" />
   </ItemGroup>