Bump Moq from 4.14.7 to 4.15.1 (graphql-dotnet#2001)

Bumps [Moq](https://github.com/moq/moq4) from 4.14.7 to 4.15.1.
- [Release notes](https://github.com/moq/moq4/releases)
- [Changelog](https://github.com/moq/moq4/blob/master/CHANGELOG.md)
- [Commits](https://github.com/moq/moq4/commits)

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

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

Author: dependabot[bot]

src/GraphQL.DataLoader.Tests/GraphQL.DataLoader.Tests.csproj

@@ -8,7 +8,7 @@
   <ItemGroup>
     <PackageReference Include="Bogus" Version="31.0.3" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.9" />
-    <PackageReference Include="Moq" Version="4.14.7" />
+    <PackageReference Include="Moq" Version="4.15.1" />
     <PackageReference Include="Nito.AsyncEx.Context" Version="5.1.0" />
   </ItemGroup>