[release] Prepare release Resources.Process-1.12.0-beta.1 (#2777)

Author: opentelemetrybot

src/OpenTelemetry.Resources.Process/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.12.0-beta.1
+
+Released 2025-May-06
+
 * Updated OpenTelemetry core component version(s) to `1.12.0`.
   ([#2725](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/2725))