[release] Prepare release core-1.18.0 (#7673)

Co-authored-by: otelbot-dotnet[bot] <233655617+otelbot-dotnet[bot]@users.noreply.github.com>
Co-authored-by: Martin Costello <martin@martincostello.com>

otelbot-dotnet[bot] committed 9d ago

9db92a4e978b4ae432183c790259be48a475578f

Parent: d528d5f

Committed by GitHub <noreply@github.com> on 8/21/2026, 11:56:13 AM