Bump GraphQL and GraphQL.MicrosoftDI in /src (#1076)

Bumps [GraphQL](https://github.com/graphql-dotnet/graphql-dotnet) and [GraphQL.MicrosoftDI](https://github.com/graphql-dotnet/graphql-dotnet). These dependencies needed to be updated together.

Updates `GraphQL` from 8.3.1 to 8.4.0
- [Release notes](https://github.com/graphql-dotnet/graphql-dotnet/releases)
- [Commits](graphql-dotnet/graphql-dotnet@8.3.1...8.4.0)

Updates `GraphQL.MicrosoftDI` from 8.3.1 to 8.4.0
- [Release notes](https://github.com/graphql-dotnet/graphql-dotnet/releases)
- [Commits](graphql-dotnet/graphql-dotnet@8.3.1...8.4.0)

---
updated-dependencies:
- dependency-name: GraphQL
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: GraphQL.MicrosoftDI
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -8,8 +8,8 @@
     <PackageVersion Include="EfLocalDb" Version="20.0.3" />
     <PackageVersion Include="Fody" Version="6.9.1" />
     <PackageVersion Include="graphiql" Version="2.0.0" />
-    <PackageVersion Include="GraphQL" Version="8.3.1" />
-    <PackageVersion Include="GraphQL.MicrosoftDI" Version="8.3.1" />
+    <PackageVersion Include="GraphQL" Version="8.4.0" />
+    <PackageVersion Include="GraphQL.MicrosoftDI" Version="8.4.0" />
     <PackageVersion Include="GraphQL.SystemTextJson" Version="8.3.1" />
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
     <PackageVersion Include="Microsoft.AspNetCore.Http" Version="2.3.0" />