fix: remove invalid 'true' argument from --no-symbols flag

The --no-symbols flag is a boolean switch that doesn't accept a value.
When 'true' was passed, dotnet interpreted it as a file path to push,
causing "File does not exist (true)" error after successful package push.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: davidkallesen

.github/workflows/release.yml

@@ -53,4 +53,4 @@ jobs:
         run: dotnet pack -c Release --no-restore -o ${GITHUB_WORKSPACE}/packages -p:RepositoryBranch=$BRANCH_NAME /p:PublicRelease=true
 
       - name: 📦 Push packages to NuGet
-        run: dotnet nuget push ${GITHUB_WORKSPACE}/packages/Atc.Rest.Client.${{ env.NBGV_NuGetPackageVersion }}.nupkg -k ${{ secrets.NUGET_KEY }} -s ${{ env.NUGET_REPO_URL }} --skip-duplicate --no-symbols true
+        run: dotnet nuget push ${GITHUB_WORKSPACE}/packages/Atc.Rest.Client.${{ env.NBGV_NuGetPackageVersion }}.nupkg -k ${{ secrets.NUGET_KEY }} -s ${{ env.NUGET_REPO_URL }} --skip-duplicate --no-symbols