Bump the aspnet-core group in /server with 1 update

Bumps the aspnet-core group in /server with 1 update: [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore).

- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v7.0.11...v7.0.12)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.OpenApi
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: aspnet-core
...

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

server/SensorServer/SensorServer.csproj

@@ -7,7 +7,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="7.0.11" />
+        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="7.0.12" />
         <PackageReference Include="Microsoft.EntityFrameworkCore" Version="7.0.11" />
         <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="7.0.11">
             <PrivateAssets>all</PrivateAssets>