[feature/9.x] Bump Microsoft.NETCore.DotNetHost from 8.0.10 to 8.0.12 in /eng/dependabot/net8.0 in the runtime-dependencies group across 1 directory

[feature/9.x] Bump Microsoft.NETCore.DotNetHost from 8.0.10 to 8.0.12 in /eng/dependabot/net8.0 in the runtime-dependencies group across 1 directory #505