build(deps): Bump GraphQL from 7.7.2 to 7.8.0 (#176)

Bumps [GraphQL](https://github.com/graphql-dotnet/graphql-dotnet) from 7.7.2 to 7.8.0.
- [Release notes](https://github.com/graphql-dotnet/graphql-dotnet/releases)
- [Commits](graphql-dotnet/graphql-dotnet@7.7.2...7.8.0)

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

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

Author: dependabot[bot]

GraphQLNetExample/GraphQLNetExample.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="GraphQL" Version="7.7.2" />
+    <PackageReference Include="GraphQL" Version="7.8.0" />
     <PackageReference Include="GraphQL.MicrosoftDI" Version="7.7.2" />
     <PackageReference Include="GraphQL.Server.Transports.AspNetCore" Version="7.6.0" />
     <PackageReference Include="GraphQL.Server.Ui.Altair" Version="7.7.0" />