GithubCI: fix dev HTTPS certificate generation

Don't use --export-path option as that path is not correct
for Ubuntu 24.04.

Add --trust options, as this is now neded and is the
recommended way by Microsoft, see [1].

[1] https://learn.microsoft.com/en-us/aspnet/core/tutorials/razor-pages/razor-pages-start?view=aspnetcore-8.0&tabs=visual-studio-code#run-the-app

.github/workflows/CI.yml

@@ -40,7 +40,7 @@ jobs:
           # Trust ASP.NET Core HTTPS development certificate so that GRPC server can be contacted through HTTPS.
           # HTTPS connection is used in end-to-end GRPC tests.
           dotnet dev-certs https
-          sudo -E dotnet dev-certs https --export-path /usr/local/share/ca-certificates/aspnet/https.crt --format PEM
+          sudo -E dotnet dev-certs https --trust --format PEM
           sudo update-ca-certificates
 
       - name: Restore nuget dependencies