Bump System.Drawing.Common from 5.0.2 to 7.0.0

Bumps [System.Drawing.Common](https://github.com/dotnet/runtime) from 5.0.2 to 7.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v5.0.2...v7.0.0)

---
updated-dependencies:
- dependency-name: System.Drawing.Common
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

DigitalLearningSolutions.Data/DigitalLearningSolutions.Data.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="MailKit" Version="4.2.0" />
     <PackageReference Include="Microsoft.FeatureManagement.AspNetCore" Version="2.0.0" />
     <PackageReference Include="Serilog.AspNetCore" Version="7.0.0" />
-    <PackageReference Include="System.Drawing.Common" Version="5.0.2" />
+    <PackageReference Include="System.Drawing.Common" Version="7.0.0" />
   </ItemGroup>
 
   <ItemGroup>