Fix NuGet trusted-publishing user (marius.bughiu, not marius-bughiu)

The NuGet.org username is marius.bughiu (dot, not dash). The first
trusted-publishing run failed with HTTP 401 / "No matching trust policy
owned by user 'marius-bughiu' was found" because I picked up the GitHub
username instead of asking.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: marius-bughiu

.github/workflows/release.yml

@@ -73,7 +73,7 @@ jobs:
         id: nuget-login
         uses: NuGet/login@v1
         with:
-          user: marius-bughiu
+          user: marius.bughiu
 
       - name: Publish NuGet package
         run: |