Bump System.Memory.Data from 7.0.0 to 8.0.0 in /Source (#4022)

Bumps [System.Memory.Data](https://github.com/dotnet/runtime) from 7.0.0 to 8.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v7.0.0...v8.0.0)

---
updated-dependencies:
- dependency-name: System.Memory.Data
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Source/GraphMergerTest/GraphMergerTest.Dal/GraphMergerTest.Dal.csproj

@@ -5,6 +5,6 @@
     <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="System.Memory.Data" Version="7.0.0" />
+    <PackageReference Include="System.Memory.Data" Version="8.0.0" />
   </ItemGroup>
 </Project>