update SIMD status and feature gate key (#237)

proposals/0182-conditional-cu-metering.md

@@ -5,9 +5,9 @@ authors:
   - Tao Zhu (Anza)
 category: Standard
 type: Core
-status: Review 
+status: Implemented
 created: 2024-10-03
-feature:
+feature: B7H2caeia4ZFcpE3QcgMqbiWiBtWrdBRBSJ1DY6Ktxbq (https://github.com/anza-xyz/agave/issues/3993)
 supersedes:
 superseded-by:
 extends: